Instructions

Page 20
Main
Secondary
Measurement Time
(4SPS)
Measurement Time
(20SPS)
Any Dual Function
None
.25s
.05s
Vac, dB, Iac
Hz*
.25s
.05s
Hz*
Vac, Iac
.25s
.05s
Vac, dB, Iac
Vdc, Idc
.5s
.1s
Vdc, Idc
Vac, Iac
.5s
.1s
Vac, dB
Iac
6s
3s
Iac
Vac
6s
3s
Vdc + Vac
Vdc, Vac, Hz
.5s
.1s
Idc + Iac
Idc, Iac, Hz
.5s
.1s
Measurement Time
(4SPS)
Measurement Time
(20SPS)
*Any Hz dual measurement
.25s
.125s
Frequency measurements have a fixed measurement time (gate time) of 0.25s or 0.125s
depending on the sample speed. This fixed measurement time only applies to the frequency
measurement, not the other dual measurement. For example if the sample speed is set to fast
(20SPS), the main measurement is Hz and the secondary measurement is VAC, then VAC will
be updated every 0.05s but the frequency measurement will only update every .125s.
9 Triggered Operation
A screw-less connector on the rear panel provides both an input and output signal.
9.1 Trigger In Signal
The trigger input (- I/P+) connects to the LED of an opto-isolator through a 1kΩ resistor.
Apply >+3V to set trigger input True; maximum safe applied input is +10V.
The trigger input can be set to perform either of two actions, as set from the Utilities menu – see
section 12.4
.
1. Hold measurement – the measurement in progress at the point that the input is set True
is frozen on the display.
2. Log measurement – with the Logging function operating, the measurement in progress
at the point that the input is set True will be logged.
9.2 Trigger Out Signal (Measurement Complete)
The trigger out signal (- O/P+) goes True each time an input trigger action is completed.
The trigger out signal is an opto-isolated open collector output with Low = True. The output
conducts for 250ms on completion of an input trigger action.
The trigger output requires an external pull-up (e.g. 4.7kΩ to 5V) and sinks typically 2mA
maximum when True; maximum safe off-state voltage is +10V.