Test Equipment

Comment

When the manual for a military radio is written the equipment listed for bench test is what was standard issue at the time.  To run the same test today you can substitute more modern equipment as long as the newer equipment has equal or better specs.

HP Agilent Serial Numbers

For serial numbers in the format iijjAnnnn adding 60 to ii is the year made, jj is the week, the letter is the country where made.
for example 1848J02842

• 18 -> Made in 1978
• 48 -> Weeek # of last prodcution change 48
• J -> Made in Japan, or A = America, G = West Germany, U= United Kingdom
• 02842 actual serial number of instrument

The series prefix doesn't represent the date of manufacture.  Instead, it represents the date of the last production change that affects form, fit, or function, or for other modifications such as firmware version changes. We use the series prefix to tie production changes (changes in production documentation) to changes in customer documentation.

Tests on Radios

Because of the FM capture effect the way receiver sensivity is measured must be different for FM and AM radios.  AM radios have no capture effect.

SINAD FM receiver sensivity

This is an acronym for "SIgnal Noise And Distortion".  It's defined as:
SINAD = 20 * LOG((RMS Value of Signal, Noise and Distortion)/(RMS Value of Noise & Distortion))

The inclusion of noise and distortion with the signal is the way a distortion analyzer works, i.e. it measures everything then notches out the test tone.  The prior signal to noise ratio was difficult to measure because it required a spectrum analyzer to measure the signal all by itself.

I think the values used for SINAD when the HP 300 series analog distortion meters were popular was 10 dB.  But these meters used a average reading AC voltage detection method that was in error about 2 dB for non sine signals.  With the introduction of the 8903 and other true RMS reading distortion analyzers the spec was changed to 12 dB to produce about the same sensitivity readings as the prior analog instruments.  (The 8903 has an internal jumper option to connect an average reading detector if compatibility with the older 300 series instruments is needed).

The common modern definition of receiver sensitivity is the power level that produces a 12 dB SINAD.

The idea is that there are two factors contributing to the received audio signal to noise ratio in an FM receiver.  First as the signal strength increases from the noise level the audio output gets quieter (this is even when there is no modulation on the carrier).  Second as the signal strength with modulation increases from the noise a 1 kHz tone will get stronger.  The difference between the true RMS audio output with the tone modulation on and the true RMS audio output with the tone modulation off is the SINAD.

Distortion Analyzer

One way to measure this in a single step is to use a SINAD meter or a Total Harmonic Distortion (THD) meter.  Both of these methods notch out the 1 kHz tone and can measure both the tone and what's left.  The advantage of this method is that you don't need to turn the 1 kHz modulation on and off.  This would be very good when testing the SINAD in the field from a transmitter at a remote fixed point.

By using a real SINAD meter like the HP 8903B/E Audio Analyzer the transmitter can be sending a constant 1 kHz tone and the meter will notch out the tone and report the SINAD.  This would allow drive testing using GPS in the mobile unit or using a time log to allow plotting SINAD vs. position of the mobile unit.  Note for receiver testing the "E"  version (no audio gen, just the meter) of the 8903 is about 1/2 the price of the "B" version (internal audio gen).

True RMS Voltmeter

Another way to measure SINAD is to just turn on and off the modulation (note the carrier is left on all the time).  This has the advantage that you only need a true RMS voltmeter instead of the SINAD meter or a THD meter like the TS-723 (HP 330 series) distortion Analyzer.  I am using this method with the HP/Agilent 8648A signal generator and HP/Agilent 34401A Multimeter under computer control so that a plot can be made of both the plain AF noise output, the 1 kHz tone output, and the SINAD.  The problem with this is the requirement to turn on and off the modulation.  Easy to do on the bench but more difficult when a mobile unit is driving.

The Distortion Analyzer, THD and SINAD - college experiment that gives the equations and explanation of SINAD
FM Modulation Tutorial -

Receive Audio Frequency Response

By using a signal generator like the HP/Agilent 8648A with option 1EP and a voltmeter like the HP/Agilent 34401A a plot of the audio frequency response can be made.  It's interesting that the PRC-25 has a peaky response centered at 300 Hz but the PRC-126 has a fairly flat response from 100 to about 9,000 Hz.  This is probably because the PRC-126 was designed to support voice encryption over an even wider audio bandwidth and the SPKR audio has been low pass filtered to improve the s/n for clear voice.

This plot was used in a before and after manner when the PRC-25 was upgraded to the PRC-25B to support multiple channel telephony.

Transmit Output

There are a number of parameters to look at on the transmitted signal:

Power

Can be measured with a power meter like the PRM-34 or similar meters.

Frequency

Can be measured with a filed test meter like the PRM-34 or a modern spectrum analyzer like the Agilent 4395A.  When the transmit output frequency is not known the spectrum analyzer is a great tool to find the frequency.

FM Deviation

Can be measured with a deviation meter like the ME-505 or ME-525 but can also be measured directly on the Agilent 4395A or other spectrum analyzer.  The HP 8901 Modulation Analyzer is a modern version of the ME-505/525.

Harmonic and Spurious outputs

The spectrum analyzer makes this an easy test but it could also be done using a receiver, but finding spurious outputs with a receiver is very tedious unless a computer can do a spectrum sweep.

General Bench Test Equipment

This paragraph is for equipment that I either have now or have used.  Since I do LabVIEW programming, instruments with IEEE-488() and/or RS-232 so that they can be computer controlled are a plus for me.  You can get a lot more out of an instrument when a computer is in control vs. manual operation.

Analyzers

HP/Agilent 4395A Combination Network, Spectrum, Impedance Analyzer covering 0 to 500 Mhz. Note this includes audio frequencies. HP-IB

What I miss is the range from 500 MHz to about 2.5 GHz.  Maybe a front end down converter is called for. If you know of one, let me know.

Bridges

Heathkit IB-5281LCR Impedance Bridge 

HP 4260A ZM71A/U Universal Bridge

HP 4332A LCR Meter - analog 3  to 1 M Ohm, 3 pF to 1 uF, 3 uH to 1 H

Marconi TF-2700 1 kHz Universal LCR Bridge

mega-T TE7 Antenna Noise Bridge

M-4  Bridge

ZM-11 AC LCR Bridge

Counters

• HP AC-4A Decade Counter Module used in the HP 531A Counter, 4 dual triode tubes & 10 each NE-2 Neon lamps
  
• HP 5216 Nixie tube display Counter
• HP 5328AF-096 Counter with HP-IB 
• HP 5345 - this is the successor to the HP 5245 and adds a display digit (9 total), goes to 500 MHz w/o a plug-in and has HP-IB
• HP 5384A - I was using the HP 8648A with about a 10 foot length of coax to drive the 5384A and was adjusting the trimmer for the internal oscillator.  In this process I was also going back and forth between the A input (Hi-Z 10 hz - 100 MHz) and the B input (50 Ohm 50 - 225 MHz).  The max power from the 8648A is +13 dBm (4.46 Vrms or 6.3 Vpk).  I'm not shure how but now the front end appears dead although the "check" function shows 10 MHz and the CPU is OK.  One the the transistors near the A input appears to be shorted.  Manual on the way to fix it.  Maybe the coax acted as a transformer raising the voltage when connected to the A input.  The fix may be to add a 3 dB BNC pad on the counter end of the coax to keep the voltage down
  
• Stanford Research SR620 Time interval and Frequency Counter - this 16 digit 1.3 GHz counter has a single shot time interval resolution of 25 pS which makes it ideal for working with 1 Pulse Per Second timing signals.  HI-IB  I feed it's external clock and that of the 4395A with a Stanford Research PRS10 Rubidium Source that is locked to the GPS system by means of a Motorola VP Oncore GPS receiver. A home Made 4-way GPS Splitter feeds the Motorola Oncore VP GPS receiver and other GPS receivers. 
• HP 53132A Counter - This counter can count frequency at the rate of 12 digits per second but has no speed advantage for Time Interval Counting.  It also has a very user hostile manual and computer interface.  Traded for the SR620. 

DC Power Supplies

• American Reliance 1132 Electronic Load - great for testing batteries and power supplies. HP-IB & RS-232 interface.
• BK Precision 1786 Power Supply 0-30 VDC @ 3 Amps better for powering radios but difficult to program by hand. RS-232
• HP 6216A Power Supply - this is a small 0-30 VDC @ 500 mA supply that good for manual analog testing CV/CC operation.
• HP 6633ASystem DC Power Supply  
  

• HP/Agilent E3631A Triple Output Power Supply with IEEE-488.2 interface only 0.5 A for each of the two 15 V sides. HP-IB

• Agilent E3617A 0-60 V 0-1A single range digital readouts but 10T analog controls for Voltage and Current.  4 times the power (and size) of the HP 6216A.  But no computer interface, it's a linear supply that can be externally controlled with the old HP programming box.  The Voltage display reads to 0.01 Volts (i.e.. 10 mV, but it is not that accurate according to my Fluke 86 DMM in 6 digit mode.  Current display resolution to 1 mA, but have not checked it.

DC Voltage Reference

Precision Voltage Reference 5V .01% Accuracy Calibrator

 is the eBay title.  From Malone Electronics, WA.

Calibrated using an HP 34401.  Very low cost ($27.50).
The data sheet that came with it said 5.00005 at turn on and 5.00021 after 15 minute warm up.
You can see I'm getting 5.00012.

The more accurate Geller SVR Voltage reference is on order.

Meters

• Boonton 160 Q meter - spent a couple of years learning about coils, uses a 4 pin tube

• Fluke 12 DMM - this one does not have current measuring capability but does have "V check".  This is an automatic operation mode that has a very useful feature.  A real world example:  When trouble shooting a sprinkler system the 87 showed good voltage from the control box with the solenoid disconnected.  The 12 showed zero volts.  the reason is that the "V check" function puts a 1 K Ohm load across the voltmeter whereas the 87 has a very high input impedance. Volts and Ohms (no Amps)
• Fluke 87 DMM - This is a powerful and easy to use handheld meter that is about bullet proof.  Someone said that you could put it into Ohms range and plug the leads into a wall socket, but I don't want to try it.  I have let the smoke out of a number of cheap meters by measuring a power supply with the range switch set on Ohms.  The current in the diode test mode is a solid 1.0 mA.  This is very good to help identify diode types.  There are some undocumented beeps that have some meaning. Volts, Ohms, Amps, frequency, capacitance.  The Max/Min function is really handy for checking to see if there was some type of failure and for ranges of a changing value.  If you only have one meter this is the one to have..
  
  

  	When trying to test a Weston 594 Photonic cell no current could be measured, but it did have voltage output.  Also voltage across a shunt 100 ohm reisitor. The self test on the Fluke 87 is to probe in Ohms mode between V-Ohm-diode connector and the mAuA connector where you should see 1 k Ohm. Failed Also the fuse check is to remove test leads, select V= or V~ plug a test lead into uAmA - meter should click if fuse is good.  Failed Plug test lead into A - meter clicks if fuse is good. Passed The yellow component is NOT blown, it's a spark gap.
  	The fuse that's standing up is open Also the yellow part OK.
  It turns out the 1k resistor from the bottom of the mA/uA jack that gets shorted by the range switch when in the mA range is not part of the analog circuitry but rather part of the digital monitoring of where the test leads are plugged in.  So it was reinstalled along with the adjacent four pin DIP bridge diode and a wire soldered across the blown fuse terminals.  After reassembly not only are the mA and uA ranges working but also the back light now works.  There must have been a bad connection (see What Goes Wrong)  between some of the parts that's now good.

  
  
• Heathkit IM-21 VTVM - used this for many years uses tubes
  
• HP 3400A True RMS AC Voltmeter - with a 10 MHz bandwidth. (the 3400B has a 20 MHz bw) uses this in many automated test systems to do the RMS detection and fed it's DC output into a digital DC voltmeter.
  
• HP 415E SWR Meter (also a 60 dB dynamic range gain/attenuation Meter) - just a very narrow bandwidth 1 kHz voltmeter.  Has many uses.
  
• HP 427A Voltmeter - This was the precursor to the DMM, portable hand held DC & AC Volts and Ohms (no amps)
• HP 432 Power Meter - Cal standard still in current catalog because it uses a fundamental measurement technique
• HP 436 Power Meter - HPIB, this and all the newer power meters rely on a 50 MHz calibration signal since they can not make a fundamental power measurement, like the 432.
• HP/Agilent 34401A Multimeter will measure AC (true RMS) and DC volts 2 and 4 wire Ohms, frequency and period, diode check and a number of other things.  HP-IB & RS-232  This is an extremely popular meter and offers very good performance for the price.  App Note on Kelvin Connection which allows measuring resistance to 0.000,1 Ohm (100 micro Ohms).
  
• ID-292 Alignment meter for the PRC-6
• ID-1189 Indicator, Channel Alignment for the PRT-4 and PRR-9 radios
• ME-61 1.5 to 24 MHz Field Strength meter made for the T-195/GRC-19 but useable for any HF Transmitter
• Millen 90651 Grid-Dip Meter -
  
• TS-20 (PRM-32) Tests survival radios by using 2 of them to talk to each other
• TS-24B Tests survival radios by placing the antenna into a shielded box with a connection that simulates free space (patented by ACR)
• PRM-34 Test Set to measure Frequency, Power using 2 ports so both radios and antennas can be tested, also has Field strength so can replace TS-3354
• PSM-13 Field Battery Tester
• TS-330 Crystal Impedance Meter can measure actual crystal parameters, unlike the crystal activity meter that's more of a go-nogo instrument.
• TS-585 - This is a military Audio Output Meter that has built in impedance matching over a very wide range.  Great for manually determining the audio input or output impedance of various audio devices.
• TS-1836 In-Circuit Transistor Tester
  
• TS-3354 - Test Set for aligning the PRC-68 after changing the channel frequency programming, could be used with other Family or squad radios
• TS-3754 (URM-182A) VHF Low Band Power Meter
  
• TS-4403/U & TS-4403A/U (Chemtronics LS 91) State Of Charge meter for LiSO₂ batteries (the only possible way to measure their SOC)
• KS-8455L2 Telephone test meter
• URM-6 14 to 250 Kc Field Strength Meter Set

Heathkit IT-10 Transistor-Diode Tester - simple way to ID diode and transistor polarity and get a rough idea of beta.  The IT-27 may be the same tester with different color paint.

This tester is very simple and seems to be very reliable.

You get some idea of relative beta.



Heathkit IT-121 Transistor & FET Tester
Uses a couple of "D" batteries and a 100 uA meter movement to test Beta, gm, and a number of leakage currents.
Needed some contact cleaner in the switches and pots (was used by a heavy smoker).  The 166 Ohm cal resistor is supposed to be taped to the inside of the front panel (it's used for setting the pot on the PCB, but if not you can make one by connecting two 100 ohm resistors in series then connecting that 200 ohm resistor in parallel with a 1000 ohm resistor.

Front Panel	Back Instructions	Inside

GE Transistor Manual "Safe and Simple Transistor Tester'.  Made this for work when we were buying Ge microwave transistors and characterizing them ourselves rather than pay TI a lot extra to sort them.  The 150 Ohm cal resistor is built in on S4 so to do the full scale cal just press BATT TEST and S3.


You can get numbers for beta, and a number of leakage currents.

  TS-1836C/U - Military in and out of circuit tester also tests FETs and diodes.  Uses self rectification of square wave input to generate a DC output when xixtor is in a common base configuration.

So far not very useful.







TL-120 - rechargable battery powered tester, automatic detection of NPN or PNP, no setttings or meters, just LEDs for PNP, NPN & Fail LEDs.  NSN 6625-00-367-9323 patent 3870953  In-Circuit Electronic Component Tester  324/72.5; 324/537 made by Testline.  Uses a single probe that has three plunger type pointed tips so you can contact all three transistor PCB pads with one hand.
Handy probe and quick check.



This Electronic Goldmine tester uses a 555 oscillator driving a Flip Flop to act as a DPDT switch reversing the polarity to a common emitter configuration.  By noting which of two LEDs turns on you can tell the polarity of a transistor.  But you need to which terminals are the Emitter, Base and Collector. 

Not too useful.
The schematic diagram for this kit should win an award for the most convoluted, upside down and twisted schematic
 possible for such a simple circuit.

M3 Semiconductor Analyzer
This is the most advanced unit for the price.  Although there are a number of things I'd do to improve it. 

There are three test leads, each of which is fed using a series resistor that's selectable (100k, 10k, 1k or 100 Ohms) and that resistor can be connected to either +5 or ground.  There's a DC voltmeter on each lead.  So by driving the leads two at a time and subtracting voltages you can find the voltage across the DUT.  Also since the voltmeters are after the series resistors you can also find the current at each lead.

I'm having a problem with calibration.  It may be that I've just got some high resistance mux chips (M3 is sending 3 more chips at no charge, good support).  It turns out that if there's solder flux left on the board it can allow leakage to the high impedance voltmeter inputs.  Radio Shack no longer carries flux cleaner, so it's not available in my small town.   Isopopropal alcohol did not work.  But acetone did work.

The problem was poor solder joints caused by using a fine tip soldering iron on a PCB with 2 ounce copper.  You MUST use a high wattage soldering iron in order to heat this PCB. Note you can see that the solder is not shiny, it's dull when inadaquate heat is used.

The neat thing about it is that it not only figures out which lead is which for transistors, FETs, etc. but it also shows some variable parameters like Vbe, H_FE, whether it's a PNP or NPN, or N-JFET or P-JFET, etc.  The display cycles automatically which may be good for an experienced user, but I'd  rather have a "next" button to make writing down the answers easier.

It's great for sorting out grab bags of 3 leaded devices.  I'm planning on adding a machined pin IC socket cut down to 3 terminals in addition to some nice E-Z-Hook grabbers to replace the cheezy ones that come with the kit.

Atlas DCA - Semiconductor Analyser  - looks to be a very similar deivce

Professional Type Semiconductor Analyzers

I wrote many HP Basic programs to dirve the HP semiconductor analyzer boxes like the 4145 DC box and the realted LCR meters.

Transistor Test Set Related Patents

Class 324/768 Electricity Measuring & Testing/ (537)Of individual circuit component or element Bipolar transistor(768)

2847645 Null Type Transisotr Alpha Measuring Set, Thomas  (Bell labs), 12 Aug 1958
2899642 Transistor Test Set, Hussey, 11 Aug, 1959 324/768 - very simple battery powered appha & Ic tester, very much like the Heath IT-10.
2909730 Transistor Gain-Bandwidth Test Circuit, Timm, 20 Oct 1959 324/768 - sweep gen & Scope
3054948 High Frequency Mesurements, Rymaszewski, 18 Sep, 1962 324/629; 324/158.1; 324/615; 324/639; 324/647; 324/650; 333/225
3056924 Null Type Transistor Beta Measuring Set, Thomas (Bell labs), 2 Oct 1962 - prior methods used b=a/(1-a)
3076140 Transistor Test Set, Smith, 29 Jan 1963 - Curve Tracer with stepped base currents
3201690 Wave Transient Time Interval Measuring Circuit with Wave Comparison Function, Embree (Bell labs), 17 Aug 1965 - sub ns
3237104 Pass Fail Transistor Tester for Indicating the combined result of BVceo and Spurious Oscillations, Merkel, 22 Feb 1966 -
3314008 Circuit Empolying Calibrated Variable Impedances for MEasuring Transistor Beta and Beta Cutoff Frequency, Heard, 11 Apr 1967 -

Scopes

• HP 120B Scope - used with the 114BR WWV Time Comparator
• HP 54501A Digital Oscilloscope - this was an early DSO from HP and has a rather user hostile front panel but it supports IEEE-488.2 interface and is a good value as used equipment though only 100 MHz BW when sampling and much less BW in single shot mode. HP-IB
• Tek 1502 Cable Tester (Time Domain Reflectometer)
  
• Tektronix 515A tube type 15 MHz scope - I got this new from Tek when I was going to college.  Picked up at the Fabian Way, Palo Alto Tek office near Philco (aka Philco Ford, Ford Aerospace, aeronurotic Ford, etc.).  They had a washing station where the scopes were cleaned.  This, and most Tek scopes, were designed to stand water washing.

Sources

• Aerospace Research Inc. Model NS-LB Noise Generator -  Manual Wanted
  
• Heathkit IG-42 Laboratory RF Signal Generator
• Heathkit IG-72 Audio generator with multiple knob frequency control, but no analog control
• Heathkit ____ - 100 KHz crystal calibrator, for use with analog  short wave receiver to know where you are tuning,  i.e. set the banband spread dial.
• HP 204B - Audio Oscillator  - dial frequency control, part of the 3550 triple instrument telephone line test set.
  
• HP 241A Audio Oscillator radio button frequency control
• HP 5100 - 5110 Synthesized RF Signal Generator - uses math and phase locked loops, many pushbuttons.  multiwire interface, used by BR communications to develop the chirp sounding system.
  
• HP 5060 Cesium Frequency Standard
• HP 8406A Frequency Comb Generator -
  
• HP/Agilent 8648A Signal Generator with options 1EP and 1E5. IEP is the pager option that allows generating POCSAG, FLEX and FLEX-TD pager signals and includes a built in function generator that will allow internal modulation from 10 Hz to 20 kHz with a sine, triangle, square or ramp wave form.  This function generator is also available without the paging features as option 1E2.  Because of the built in function generator a separate audio generator is not needed. HP-IB.  The 8648 did not have good enough stability for pager testing hence the 8648A with much improved specs.
• Stanford Research SC10 - 10 MHz double oven crystal oscillator retro fitted into old Gibbs frequency standard.
• Gibbs Frequency Standard.  This unit had a fatal design flaw.  A rack mount unit with the electronics on one side and some gel cell Lead Acid batteries on the other side.  What happens to printed circuit boards when you heat them and expose them to acid fumes  .   .   . the traces are etched away.

When I bought it the seller said it was only good for 1E-6 (i.e. the oven did not work, but it oscillated.  I soldered wires over the etched traces and brought it back to life (parts in E-10), but after adding glass caps to get the frequency back on, the crystal finally aged past the point where it could be pulled to 5.0 MHz.
The Bliley glass crystal was in the center of a dual cylindrical heater. between the outer and inner heaters was the electronics made up of ring shaped PCBs with the components between two of the rings "cord wood" style.  There was a pair that was the oscillator, and two pairs for the inner and outer oven control circuits.
• Stanford Research PRS10 - 10 MHz Rubidium oscillator locked to GPS, RS-232
• Stanford Telecom 5001A Navstar Test Transmitter - for testing GPS receivers that were built at Stanford Telecom for jitter.
  
• SG1144U - RF Signal Generator - dual analog oscillators are mixed to generate the output.

Table of Mil Test Equipment

These are instruments that show up in the military radio manuals but that I don't have.  Just for info. 

Mil Nomenclature	Description	Commercial Nomenclature	Power	Const	Key Spec(s)
AN/USM-281C	Oscilloscope	Tek 7603N11S TM 11-6625-1703-24P	120/220
OS-246A/USM-281D	Oscilloscope	Dumont	115/230
OS-189/USM-281A	Oscilloscope	HP 180+ PL-1186A  PL1187A
USM-425	Oscilloscope	Tek 465M	115/230 or  24 VDC Batt
OS-8	Oscilloscope	TM 11-1214 TM 11-6625-252-20	115
OS-106/USM-117	Oscilloscope	TM 11-6625-640-24P TB 9-6625-342-35		Transistor
USM-338	Oscilloscope			solid state
USM-140B	Oscilloscope	Tek 531?
SG1174/U	Sig Gen	AUL 6201B TM 11-6625-2952-24P		tube	3.8 - 7.6 GHz
SG-297/URM-103	Sig Gen	TB 11-6625-586-12/1		tube	18 - 80 MHz FM
SG-376	2 tone IF Sig Gen			Transistor	497.5, 498.5, 501.5, or 502.5 KHz
SG-823	2 tone Ref Sig Gen				2, 3.6, 4, 14.4, 16, 28.8 MHz
/URM-25	Sig Gen	TM 11-5551B TM 11-6625-278-20P TM 11-6625-603-40P			10 KHz to 50 MHz AM
SG-117/URM-26B	Sig Gen		115		4 to 405 MHz AM-CW-Pulse
SG-1170/1171	Sig Gen	Wavetek 3001 TM 11-6625-2952-24P TM 11-6625-3029-14,-24P TM 11-6625-3051-12, -24P, -40 TB 9-6625-2094-35
SG-1144	Sig Gen	TM 11-6625-2954-14&P TM 11-6625-2954-24P			50 kHz - 80 MHz
URM-103	Sig Gen	TM 11-6625-586-12, -12/1, -24P, -45
8350B	Sweep Gen	HP 8350B TB 9-6625-2124-35
USM-207	Digital Counter	TM 11-6625-700-10 -14-1, -25, -24P
CP-772A/U		HP 5245L TM 11-6625-1682-24P
USM-459	Digital Counter	HP 5328 TM 11-6625-2941-14&P TM 11-6625-2701-35 TB 9-9925-2334-35
AN/USM-323	Sig Gen	HP 8640B-323			500 KHz to 512 MHz AM-FM-Pulse
TS-403	Sig Gen	TM 11-5091 HP 616B			1.8 - 4.2 GHz
SG-557/TS-621	Sig Gen				3.8-7.5 GHz
USM-441	Time Mark Gen	Ballantine 6130A	120
TS-1010/UPM-84	Spectrum Analyzer		115	tube	10 MHz to 44.88 GHz
ME-180/USM-116	AC-DC Voltmeter		115	tube	20 Hz to 100 MHz 1 to 300 V fs
ME-440/USM-381 to 15 kV	Diff DV VM	Fluke 896A 1 kV			0-10-100-1000 VDC
ME-297/USM-223	Multi Meter		6-PXB1  1.3 V 1-"C" conved 2 AA + 1 C	FET	2.5 V - 5 KV 0.25 - 10 A DC 1K - 10 M Ohm
		HP 3478 TM 11-6625-3071-14
ME-77/URM-105C	Volt - Ohm	TM 11-6625-203-12, -24P, -35	2 ea. AA 22.5 V?		1 - 1000 V AC/DC 2k - 20 M Ohm 30 Hz-10KHz
URM-127(A)	Audio Osc	TM 11-6625-683-14, -24P TB 9-6625-1998-35	115	solid state	20 Hz to 200 KHz
	Audio Osc	HP 202C TM 11-6625-589-15
DA-43/U	Dmy Ld & Watt Mtr		28VDC		0.2 to 20 MHz 2 to 100 W
TS-3329/U		HP 236A TM  11-6625-2903-14&P
DPM-3	Power Meter				30 to 600 MHz 50 and 150 W ranges
ME-165/G	SWR Meter	TM 11-6625-333-15, -24P TM 11-809-20, -35			up to 30 MHz 600 W
URM-120A	Watt Meter				2 to 1000 MHz 10 to 1000 W
DA-75/U/URM-120	Dmy Ld	TM 11-6625-446-15			2 to 1000 MHz 10 to 1000 W
ME-82	Watt Meter	M 11-6625-595-34			50-600 MHz 120 W
DA-189/GRC	Dummy Load				600 to 1850 MHz 40 W
DA-727	Dummy Load				30 MHz 800 W
ZM-4	DC Bridge	TM 11-2019 TM 11-6625-249-12P, -34P TB 9-6625-388-35	3 each D	no active devices	1 ohm to 1,011 M Ohm
ZM-11	AC Bridge	Navships 91704A	115	tube
TS-505	VTVM	TM 11-5511 TM 11-6625-239-12, -34P	batt	tube
URM-145	Voltmeter	TM 11-6625-524-14
ME-26B/U	Multimeter	HP 410 TM 11-6625-200-12, -15, -24P, -35
TS-352/U	Multimeter	TM 11-6625-366-10, -15, -24P
TS-723/A/B/C/D	Spectrum Analyzer	TM 11-6625-255-14,  -24P, -34P HP 330x Distortion Ana
ME-505	Modulation Meter	TM 11-6625-3017-14 TF 2300A
ME-525	Modulation Meter	TM 11-6625-3059-10 82AD
ME-57	Modulation Meter	TM 11-6625-400-20P, -35, -40 TM 11-6625-2629-14&P, -24P TB 9-6625-2004-35 tube type
USM-44	Sig Gen	HP 608
URM-18	Distortion Analyzer	HP 333A
TS-4084/G	Distortion Analyzer	Tek DA 4084 ? NSN 6625-01-217-0054 TM 11-6625-3152-14
Tek 1502	TDR	TM 9-4935-601-14-3&P	115AC/230AC/12DC		1 to 2,000 feet of line
		HP 530x Counter TB 9-6625-2215-35
LA-387A		HP 5233L Counter TM 11-6760-242-24P

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