Unipulse F325, Руководство по эксплуатации

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59
7 Settings and Operations Related to Hold
59
Se
tting
s an
d Op
er
ations Related
to
Hold
Chapter
7
t1: The time from the point where a HOLD signal is input to the point where the signal is held.
t2: The time from the point where a HOLD signal is canceled to the point where a hold is fixed.
t3: Minimum reset signal range required for fixing a hold.
t4: The time from the point where a H.RESET is input to the point where an indicated value
returns to tracking.
t5: Minimum reset signal range required for releasing a hold.
7-2.
Peak hold selection
Performance of peak hold can be switched between digital and analog.
■
Peak hold selection setting method
1.
Select setting mode 5.
→
(four times)
2.
Select "peak hold selection".
Press the key six times.
Set the peak hold selection using the
keys, and confirm it with the key.
3.
Press the key to return to the indicated value display.
FNC
＋ －
ZERO
1: Analog
0: Digital
Peak hold selection
CAL
HOLD
GAIN CAL
HOLD
FNC
＋ －
- If peak hold is performed in analog, higher speed peak can be captured since it
is not affected by the sampling rate and so forth. However, the effects of the
moving average filter and digital low-pass filter will be lost. Performing peak
hold in digital is recommended for measurement that weighs stability such as
low-speed measurement.
- Peak hold (analog) uses a peak hold (capacitor charge) circuit. Therefore,
when HOLD is ON, a displayed value may be increased due to influence of sig-
nal noise. The higher the calibration gain (high-resolution display at low sensor
out), the higher the value.
- When peak hold is performed in analog, the current sensor input value cannot
be checked since an analog circuit is held during peak hold. Therefore, the fol-
lowing limitations are imposed during peak hold.
- Digital zero cannot be performed.
- Digital zero reset cannot be performed.
- Alarm output monitors hold values, not sensor input values.
- Indicated values non-linked (SI/F, RS-485, BCO, BSC, DAV, DAI)
all become outputs linked with indicated values.
* Analog monitor input does not perform peak hold. It outputs against the cur-
rent sensor input values.
Key points