Impedance Field; Preset Field - HP 1652B Getting Started Manual

Impedance Field
Preset Field
The Impedance field is located in the middle of the middle row of
fields. It sets the input impedance for the channel selected. When the
Impedance field is selected, the input impedance will toggle between
1
MS2 (dc) and 50 Sz (dc). No pop-up keypad is available for this field.
The default value for the Impedance field is
1
MOhm.
The Preset field is located on the right side of the middle row of fields.
It automatically sets offset, Wdiv, and trigger level values to properly
display TTL and ECL logic levels.
When you select the Preset field, a pop-up will appear as shown in
figure 23-5. Rotate the knob until the proper field is highlighted, then
touch the select key.
TTL
bEI
ECL
USER
Figure 234. Preset Field Pop-up
When you select TTL or ECL, the following values are set:
PRESET VALUE
PARAMETER
ECL
TTL
V/DIV 500MV
1.5v
OFFSET
-1.0v 2.5v
TRIG LEVEL
-1
.300V 1 .620V
&
0165ZM0l
Table 23-l. Preset Value
When any of the values listed in table 23-1 are changed from the preset
value, the Preset field will change to User defined. If User is selected
from the pop-up, no values will be changed.
The default value for the Preset field is TTL.
HP 16528/16538
Front-Panel Reference
Channel Menu
23-s