Meters: Frequency Determining

Product Details:
JBT reed type frequency meter indicates cycles per second both from 47 - 53 Hz and 57 - 63 Hz. 50/60 Hz. 3-1/2" diameter. Fits 2-3/4" hole. 2-7/8" deep. Perfect for monitoring the frequency of your 115v or 230v ac mains from your generator or power company. Maintaing exactly 60 Hz is important for efficiency on US mains. 50 Hz in most other countries.

Product Details:
Frahm frequency meter. "Reed type". Scale reads 58 - 62 CPS. 100 - 150 volts. 3-1/2" diameter bezel. Requires 2.8" hole. 3" behind panel depth. LAST ONE! Chipped flange at screw mount. NEW.

Product Details:
JBT reed type frequency meter indicates cycles/sec from 48-52 Hz in 1 Hz steps. 3-1/2" diameter face.

Product Details:
General Electric giant nuclear electronic frequency meter indicates 55 - 65 Hz. 4-3/4" wide x 4-3/8" high face. 4" behind panel. Fits 4" hole.

Product Details:
JBTfrequency meter. 39 - 41 Hz. 10 vac. 1-1/2" hole required. 2" diameter bezel. 2" behind panel depth. Scaled.

Product Details:
Varo AC frequency panel meter scale reads 340 - 440 Hz / 390 - 404 Hz. 4-1/2" diameter face. Fits 3-1/2" hole.

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A&M sealed meter for use with external transducer. Scale: "388 - 412 Hz". Actual full scale = 100 µa. 3-1/2" diameter face. Fits 2-3/4" hole.

Product Details:
JBT reed type frequency meter indicates cycles/sec from 48-52 Hz in 1 Hz steps. 3-1/2" diameter face.

Product Details:
Mil-spec 380-420 Hz system includes separate transducer (631-16394) and Phaostron 3-1/2" meter (20690D1). Meter is 200 µADC full scale.

Product Details:
Antique JBT frequency meter. Reed type. 100v - 130v, 56 - 64 Hz. In original leather case. Excellent condition. Meter is enclosed in a black bakelite case. Looks to be unused.

Product Details:
Astron RS-12A power supply. Removed from service.

• Input: 105 - 125 vac
• Output: 13.8 vdc @ 9 amps continuous, 12 amps ICS, Tested to 11.3 amp output
• Dimensions: 4-1/2" x 8" x 9"
• Weight: 13 lbs

Product Details:
Western Electric T-44-A magnetic microphone assembly includes MC-253A mic, M-369 mic cover, CO-287 woven cloth cord, PL-179 plug and JK-26 jack. The PL-179 plugs directly into the aircraft. The JK-26 accepted headset plug. These are brand new in boxes and include instruction sheet. Boxed 4 / 43.

Product Details:
1/2" silver plated copper alloy clip. Fits 1/2" - 5/8" cartridge. 1/2" x 5/8", 7/8" high. NSN: 5940-00-583-6446.

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Radiall "SMA" male plug. 18 GHz, 50 ohm. Solder, straight cable mount. 0.085". RG-405, semi-rigid. Gold over nickel.

Product Details:
Narda RF attenuator. 10 dB attenuator, 20 watts, DC-4 GHz. "N" female / male connectors.

Product Details:
A&M Instruments frequency meter. Model 369-048. 380 - 420 Hz. 3.5" bezel outside diameter, 4.5"L. 3 hole panel mount, 2 screw terminals. Brand new in the box. DC: 9108+.

Product Details:
A & M frequency meter. 300 - 550 Hz. 3 1/2" D face. 4" behind panel depth. 100 - 130v AC. NSN:6625-01-068-5875.

Product Details:
Aero Instrument frequency meter. 380 - 420 Hz. 2 3/8" D. 3 1/2" SQ. 2 1/8" hole seq. Reed type.

Product Details:
Electro Industries digital frequency meter. Range 50-999.9 Hz max, 135v AC max power supply. 300v AC max input to accurate to .1%. New-unused. 4-3/4"L x 3-5/8"W x 3-1/4"H.