Input Impedance Check; Frequency Response Check; Frequency Response Test Setup - HP 3400A Operating And Service Manual

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Section
VOLTMETER CALIBRATOR
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Figure 5-1. Accuracy. Linearity. and DC Output Test Setup

5-9. FREQUENCY RESPONSE CHECK.

Connect 50n feedthru termination
directly to 3400A INPUT to elimi­
nate loss in output cable at high
frequency.
a. Connect test setup illustrate d i n Figure 5-2.
b. Set Model 3400A RANGE switch and Test
Oscillator output atienuator to 1 volt position .
c . Set Test Oscillator for 400 H z output and ad­
just output ampli t ude for the reading obtained
in Paragraph 5-8 step d on the Model 3400A.
d . Switch the Test Oscillator monitor switch to
expand mode and set a convenient reference
level.
e. Adjust test oscillator output frequency to
values listed under ' ' frequency''
5-3; adjust oscillator
maintain reference level set in step d .
Model 3400A does not indicate within values
under "meter reading" in Table 5-3. perform
high frequency calibration procedures. Para­
graph 5-25 .
TEST OSCILLATOR
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5-2
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Figure 5-2.

Frequency Response Test Setup

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Table 5-3. Frequency Response Check
FREQUENCY
15 Hz
4 5 Hz
100 Hz
900 kHz
1 . 2 MHz
1. 8 MHz
2. 2 MHz
2. 8 MHz
3 . 2 MHz
9. 8 MHz
5-10 . INPUT IMPEDANCE CHE C K .
5-ll. RESISTANCE CHECK.
a. Connect the Test Oscillator. 50 ohm feedthru
and -hp- Model 3400A to position A in Figure
5-3.
b. Set 3400A t o 1 volt range and Test Oscillator
to 400 Hz.
c. Adjust Test Oscillator output for 1 volt 'in­
dication on Model 3400A .
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FEED-TttRU
TERMINATION
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Model 3400A
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HIGH GAIN/
AUTO RANGE
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UNIT
METER READING
0 . 95 to 1 . 0 5
0. 95 to 1 . 05
0 . 99 to 1 . 01
0 . 99 to 1 . 01
0. 98 to 1 . 02
0. 98 to 1 . 02
0. 97 to 1. 03
0. 97 to 1 . 03
0. 95 to 1 . 0 5
0. 95 to 1 . 05
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