Protek 9216A, Руководство пользователя, Страница: 26 / 77

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Table 3-3: Table for appropriate values
Variables Appropriate Values for Variables
N
m
Slow 8
Medium 8
Fast 5
N
i
100/120Hz 1KHz 10KHz 100KHz
Slow 20 40 400 4000
Medium 4 4 40 400
Fast 2 2 20 200
T
xx
T
rs
T
di
T
d
T
calc
T
s
1/f 2 ms 2 ms 3 ms 2–99 ms
setting the frequency or checking what range the meter is on, can be returned in
about l0 ms. Longer responses, like XALL?, can take as long as 2 seconds over
the RS-232. If communications speed is critical, the binary data format, which
reduces the number of bytes transferred, can be used.
Settling Time
Occasionally it is advantageous to delay making a measurement after the meter
is triggered. This allows bias voltages on capacitors to stabilize or contacts on a
handler to debounce. The settling time is set in 1ms intervals from 2 to 99 ms.
To set the settling time,
1. Press the CAL
key until the “settle” message appears in the left
alphanumeric display and the present settling time, in the right display.
2. Enter the new settling time value, from 2 to 99.
3. Press the ENTER key.
If an illegal value is ent
ered, the meter will beep and display “range error.”
Triggering
The 9216A can make measurements continuously or in response to a trigger. To
change the trigger mode:
1. Press the MODE key in the TRIGGER group of front panel keys until the
desired mode LED is on; either CONT or TRIGGERED may be selected.
2. In the continuous mode, the meter will trigger itself at its maximum
measurement rate. In the trigger mode, the trigger can be from the TRIG
button or from the RS232 or Handler interface.
The TRIG LED will flash whenever the TRIG key is depressed and the meter will
make a single measurement.