Initial Checkout
Model 560H
TEST EQUIPMENT REQUIRED
FUNCTION GENERATOR
Wavetek Model 180 or equivalent.
PRECISION VOLTAGE DIVIDER
ESI RV622A or equivalent. The divider must
have an input resistance of 10 k
or more.
DIFFERENTIAL OSCILLOSCOPE
Tektronix 5110 main frame, with 5B10N time
base and 5A21 differential amplifier or equiva-
lent. Be sure the oscilloscope has been
adjusted for common-mode rejection accord-
ing to the manufacturer’s instructions as differ-
ential measurements are used in the procedure
that follows.
RESISTORS (CARBON FILM OR
COMPOSITION, ¼ W)
One 10 k
, and one 100
.
PROCEDURE
GAIN (REFER TO FIGURE 4-1)
Although the Model 560H is designed as a
differential amplifier, it may also be operated in a
single-ended mode. Gain and frequency response
tests are made in the single-ended, noninverting
mode.
1. Connect the commons of the oscillator,
voltage divider, oscilloscope, and the
amplifier under test Pins 7 and 13 to a single
point. All measurements will be made in
reference to this point.
2. Connect the single point to power line
ground.
3. Connect the oscillator output to the input of
the voltage divider.
4. Connect the output of the divider to the
noninverting input J1, Pin 14. The other input
J1, Pin 13 is connected to the single-point
common.
5. Connect the amplifier wideband output J1,
Pin 4 to the oscilloscope input. The
oscilloscope must be direct coupled and
adjusted to zero. The wideband output can be
observed between the blue and black front-
panel jacks on the Model 560H.
6. Adjust the output of the oscillator to
minimum.
7. Apply power to the amplifier. The trace on
the oscilloscope should show that the output
of the amplifier is within a few millivolts of
zero.
8. Position the vernier switch to out.
9. Position the gain switch to 1000.
10. Adjust the output of the oscillator to 10 V p-p
at 100 Hz.
11. Adjust the voltage divider to the reciprocal
(0.001) of the gain setting. The oscilloscope
should show approximately 10 V p-p.
12. Switch in the 100:1 input divider S5.
13. Adjust the voltage divider to the reciprocal
(0.1, or 0.001 times 100) of the new gain
setting (10, or 1000 divided by 100). The
oscilloscope should again display
approximately 10 V p-p.
4-2
Figure 4-1: Initial Amplifier Test Setup
