Performance Verification
8
013-0278-00 Video Display Clamp
Table 7: Test Equipment (Cont.)
Item Number and Description
Purpose
Example
Minimum Requirements
7.
Generator, Leveled Sine
Wave
60 Hz; Variable amplitude from 5 mV to
4 V
p-p
into 50
Ω
TEKTRONIX SG502 Lev-
eled Sine Wave Genera-
tor
1
60 Hz rejection check
8.
Generator, Pulse
0 to 3 V, 15 kHz pulses with independent
controls of the top and bottom pulse
levels; Variable pulse duration and pulse
period; Normal output and its comple-
ment
TEKTRONIX PG502 Pulse
Generator
1
Back porch correction and
gain accuracy checks
1
Requires a TM500 or TM5000 Series Power Module Mainframe.
Procedures
These procedures check the characteristics of the Video Display Clamp listed as
checked under
Warranted Characteristics
in the
Specifications
section
.
These procedures check those characteristics that relate to the back porch
correction capability of the Video Display Clamp listed as checked under
Warranted Characteristics
in the
Specifications
section
.
Equipment Required:
One test oscilloscope (Item 1), one pulse generator
(Item 8), one 2.5X attenuator (Item 4), one 50
Ω
terminator (Item 3), one
dual-input coupler (Item 5), and one precision coaxial cable (Item 2).
1.
Set the test oscilloscope as follows:
H
Set the sec/div scale to 10
s
H
Set the channel 1 volts/div scale to 100 mV, DC coupled
H
Set the channel 2 volts/div scale to 500 mV, DC coupled
H
Position both channel 1 and 2 traces to center screen
H
Display channel 2 (channel 1 off)
2.
Connect the output of the pulse generator to the test oscilloscope as shown in
Figure 6.
NOTE
. This test setup provides a display of the test signal on channel 2 and a
clamped test signal on channel 1.
Back Porch Correction
Check