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Performance Verification
4–28
1780R-Series Service Manual
b. Select INPUT–PROBE and WFM HORIZONTAL ONE–FIELD mode
of operation. Check that PROBE–X1 is selected on PAGE 2 of the
Configure menu.
c. Set the generator output frequency to 50 kHz (reference). Set the
generator output amplitude so the display on the Waveform CRT is
exactly 714 mV or 100 IRE for NTSC (700 mV for PAL) in amplitude.
This is the reference amplitude.
d. Set the generator frequency to 1 MHz.
e. Check that the displayed amplitude on the Waveform CRT is within ±3%
or ±21.4 mV for NTSC (±21.0 mV for PAL) of the amplitude noted in
part c. of this step.
f. Set the generator frequency to 3.58 MHz (4.43 MHz for PAL), 5 MHz,
8 MHz, and then 10 MHz.
g. Check that the displayed amplitude on the Waveform CRT is within ±3%
or ±21.4 mV for NTSC (±21.0 mV for PAL) of the amplitude noted in
part c. of this step for each frequency given in part f.
NOTE. To check X1 and X10 frequency response from 25 Hz to 100 kHz, use the
sine wave generator (Item 10) described in the Recommended Equipment List.
Use 50 kHz as the reference.
h. Leave the equipment connected as is to perform the next step.
18. Check X10 Probe Frequency Response
Requirement: Flat frequency response from 25 Hz to 10 MHz within ±3%.
50 kHz is used as a reference.
a. Check that the equipment is connected as described in Step 17.
b. Insert a 10X 75 W attenuator between the minimum loss attenuator and
the 75 W feed-through terminator.
c. Set the 1780R-Series controls as follows: CONFIGURE–On, PAGE 2,
PROBE–X10. Check that INPUT–PROBE, REF–EXT, WFM HOR-
IZONTAL–ONE–FIELD, and DC RESTORER–Off are selected.
d. Check Repeat parts c. through g. of Step 17 to check X10 probe
frequency response.
e. Disconnect the equipment from the PROBE input connector.
f. Disconnect the 75 W termination from the PIX MON OUT connector.