General Cambridge 1967 GR R-F Radio Frequency Bridge Type 916-AL + Manual (DW) For Sale

General Cambridge 1967 GR R-F Radio Frequency Bridge Type 916-AL + Manual (DW)


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General Cambridge 1967 GR R-F Radio Frequency Bridge Type 916-AL + Manual (DW):
$425

Great condition! I opened it up to make sure all of the parts are there that match the pictures in the manual. This item is from the estate of an electrical engineer who worked for FPL. Every item from this estate is in pristine condition. Feel free to ask any questions, but please understand I don't really understand what this item is or what it does.

Satisfaction is guaranteed 100% and backed with a FULL REFUND! I absolutely WILL do my best to take care of ANY and ALL issues. I am a real person, not some corporation. I also happen to be mellow and easy going, so please feel free to talk to me with any questions or concerns. Check my response and buy with confidence!

No international shipping for this item.

Here's a link to a PDF of the manual. The actual manual is inside the manila envelope seen in the pics.

General Description:
The Type 916-AL Radio-Frequency Bridge is a null instrument for use in measuring impedance at frequencies from 50 kc to 5 Mc. The low-frequency limit is mainly determined by sensitivity considerations and in most cases measurements can be made with slightly decreased accuracy at frequencies as low as 15 kc. Measurements can also be made at frequencies somewhat above the nominal upper limit with decreased accuracy and sensitivity.

The bridge is used with a series-substitution method for measuring an unknown impedance, ZX, in terms of its series resistance component, RX, and series reactance component, XX. The resistance is read from a variable-capacitor dial directly calibrated in resistance (in ohms). The reactance is read from two variable-capacitor dials directly calibrated in reactance at 100 kc. The resistance dial readings must therefore be divided by the operating frequency in hundreds of kilo-cycles. The resistance dial reads from 0 to 1000 Ω; the main reactance dial from 0 to 11,000 Ω; and the incremental reactance dial from 0 to 100 Ω at 100 kc.

Specifications:
Ranges of Measurement:
Frequency: 50 kc/s to 5 mc/s. Satisfactory operation for many measurements can be obtained at frequencies as low as 15 kc/s.
Reactance: ± 11,000 Ω at 100 kc/s. This range varies inversely as the frequency; at other frequencies the dial readings must be divided by the frequency in hundreds of kc/s.
ΔX Dial: 100 Ω at 100 kc/s.
Resistance: 0 to 1000 Ω
Accuracy:
Reactance: Below 3 Mc/s, ±(2% + 0.2 x 100/fke Ω + 3.5 f2kcR x 10-10 Ω), where R is the measured resistance in ohms and fkc is the frequency in kc/s. The errors increase at frequencies above 3 Mc/s; at 5 Mc/s, the accuracy is ±(2% + 0.01 Ω + 2.3R1.4 X 10-3 Ω).
Resistance: Below 5 Mc/s, ± (1% + 0.1Ω), subject to correction for residual parameters at low frequencies. The correction depends upon the frequency and upon the magnitude of the unknown reactance component.

General:
Generator: External only (not supplied). Type 1330-A Bridge Oscillator, Type 1211-C Unit Oscillator, Type 1001-A Standard-Signal Generator recommended.
Mechanical:
Size: 13.5" W x 17" H x 11.25" D (345 mm x 435 mm x 290 mm)
Weight: Approx. 40 lbs.




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