HP 3720A - Display Sensitivity Faults

Table 4-4 Range transfer check
3721A Controls
A INPUT DISPLAY
RMS VOLTS GAIN
AVERAGING
1-2
.4 - 1
.2
- .4
.2 - .4
.2 - .4
.2 - .4
.1 - .2
.04 - .1
MIN
MIN
MI N
MIN
MIN
int
int
MAX
EXPONENTIAL
x 1
EXPONENTIAL x 1
EXPONENTIAL x 1
EXPONENTIAL x 10
EXPONENTIAL x 100
EXPONENTIAL
x 100
EXPONENTIAL
x 100
EXPONENTIAL
x 100
3720A
DISPLAY SENSlTl V ITY
Reading
1 .o
2.0
2.0
5.0
-
x 10-l
x
10-3
10-4
10-5
x
3720A
DISPLAY
SENSITIVITY
Reading
~ ~~
1 .o V2 /d iv
2.0 x lo-' V2/div
5.0
x V2/div
5.0~ V2/div
5.0 x V2/div
2.0
x V2/div
5.0
x V2/div
5.0
x V2/div
Table 4-5 Range data logic check
3721A
DISPLAY SENSITIVITY
Reading
1 .o
2.0
2.5
5.0
xl
x 10.l
x
10-3
x 10-4
10-5
x
3721 A
DISPLAY
SENSITIVITY
Reading
1.0~ 1 V2/CM
2.5
x lo-' V2/CM
5.0 x V2/CM
5.ox 10-3
VVCM
5.ox 10-4 VVCM
2.0 x 10-4 VVCM
5.0 x V2/CM
5.0~ V2/CM
3720A J3/
3721A 518 Pin"
29
33
27
-
31
34
28
26
30
32
*All
of these pins should be high (+12V) except those of any displayed characters which should be
as shown in Figure 4-5.
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