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Model 739A
Page 1
SECTION I DESCRIPTION
The @ Model 739A Frequency Response Test Set simplifies frequency response determination by providing a convenient constant amplitude reference voltage of variable frequency. Frequency response of vacuum tube voltmeters, oscilloscope, video amplifiers and filters from 5 cps to 10 mc* can be quickly and easily checked. attenuator reduces the signal to an appropriate output level which appears a c f o s s 50 ohms a t the end of the special output cable supplied.
.30-IO MC
ATTEN. IOdb STEPS
The Frequency Response Test Set contains a wide range oscillator, special voltmeter and s t e p attenuator a s shown in Figure 1. The osciilator generates constant amplitude signals between 300 kc and 10 mc. The monitoring circuit is flat from 5 cps to 10 m c so that an external oscillator s u c h a s @ Model 200s can be used to reduce the lower frequency limit to as low a s 5 cps. Oscillator output is applied to the monitoring voltmeter, which samples the input to a stepattenuator. An arbitrary reference level is maintained on the monitoring meter as the frequency setting is varied. The
METER
SET
50
2
5 0
5
MONITOR
E n INPUT
RO
Figure 1. Model 739A Block Diagram
SPECIFICATIONS
FREQUENCYRANGE: INTERNAL OSCILLATOR: REQUIREMENTS FOR EXTERNAL OSCILLATOR: FREQUENCY RESPONSE OF MONITORING CIRCUIT: OUTPUT:
5 cycles* to 10 mc.
300 kc to 10 m c in 3 ranges.
Frequency range 5 CPS to 300 kc requires 3 volts into 50 ohms, distortion less than 1%.
Flat within 50.5% from 10 CPS to 5 mc; within+0.5%, -l.S%, 5 cps to 10 mc. Monitor circuit is average responding.
At least 3 volts a c r o s s 50 ohm cable termination. Adjustable in 10 db steps by a Oto70 db attenuator. Fine adjustment provided. Rack Mount: 7 in. high, 19 in. wide, 9 in. deep. 739A-16A Output Cable, 50 ohm termination. BNC to shielded dual banana plug, (extra cables available on special order).
DIMENSIONS: ACCESSORIES FURNISHED
*
Extended frequency range when used with @ Model 200s Oscillator.
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