Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 143
Using Handler Interface
Input/Output Signal Pin Assignment
14, 15 EXT_DCV2 Input
External dc voltage. This supplies the voltage to the input
signals (EXT_TRIG and /KEY_LOCK) and the operation
output signals (/ALARM, /INDEX, /EOM, and
/READY_FOR_TRIG). The input voltage range is between
+5 V and +24 V.
16, 17, 18 +5 V
Output
Internal dc voltage.
19 /PHI
Primary-parameter-upper-limit-exceeded signal. When
the upper limit of BIN1 - BIN9 is exceeded, this becomes
LOW.
20 /PLO
Primary-parameter-lower-limit-not-reached signal. When
the lower limit of BIN1 - BIN9 is not reached, this
becomes LOW.
21 /SREJ
Secondary-parameter-out-of-limit signal. If the secondary
parameter is out of the limit, this becomes LOW.
22 /READY_FOR_TRIG
Trigger-acceptable signal. When a
trigger-signal-acceptable state is established, this
becomes LOW. When the handler receives this signal, an
external trigger signal can be input.
23 /LOWC_OR_NC
Low-C-reject-detection signal occurs at 120 Hz, 1 kHz
and 1 MHz and No_Contact is available at 120 Hz and
1 kHz. For Low-C-Reject, if the measured Cp or Cs result
is equal to or less than the preset boundary value
(percentage of the measurement range), Pin 23 value
becomes LOW. For No-Contact detection, if the
measurement value becomes very less i.e 9.99E37, Pin 23
becomes LOW.
24 /OVLD
Measurement-impossible signal. If measurement is
impossible in the analog measurement part (overload),
this becomes LOW.
25 /KEY_LOCK Input
Key-lock signal. If you set this signal to LOW, the front
panel keys of the E4981A are disabled.
26 (reserved) ——— Not used in the current release. Do not connect anything.
27, 28 EXT_DCV1 ———
External dc voltage for judgemental system is not used in
E4981A as PullUp resistors are not mounted inside the
E4981A.
Table 8-2 Description of the handler interface input/output signals
Pin
number
Signal name
Input/
output
Description
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