Hioki RM3545, Инструкция по эксплуатации, Страница: 182 / 364

9.2 D/A Output Specifications
174
•
The D/A output's GND pin is connected to the Protected Earth (to the metallic part of the
case).
•
The instrument has an output impedance of 1 k
Ω
. Connected devices must have an input
impedance of at least 10 M
Ω
. (The output voltage is divided by the output resistance and
input impedance, resulting in a reduction of 0.1% for 1 M
Ω
.)
•
Connecting a cable may result in external noise. Implement a lowpass filter or other mea-
sures as needed in the connected device.
•
The output voltage is updated at the resistance measurement sampling timing.
•
Recorded waveforms are stepped (since the output circuit response is extremely fast
compared to the update period).
•
When using auto-ranging, the same resistance value may result in 1/10 (or 10 times) the
output voltage due to range switching. It is recommend to set the range manually.
•
Output is set to 0 V when changing settings (range switching, etc.) and when the instru-
ment is turned off. Additionally, output of about 2 V is generated momentarily when the
main power switch on the rear of the instrument is turned on.
•
To maximize the D/A output response time, set the measurement speed to FAST and
self-calibration to manual. (
See:
"3.3 Setting the Measurement Speed" (p. 50)
,
"4.12 Main-
taining Measurement Precision (Self-Calibration)" (p. 92))
9.2 D/A Output Specifications
Output Resistance measured value (display value after zero-adjustment and temper-
ature correction but before scaling and
Δ
T calculation)
Output voltage 0 V (corresponds to 0 dgt.) to 1.5 V DC*
If a measured value fault occurs, 1.5 V; if the measured value is negative, 0 V
* For a 1,200,000 dgt. display, corresponds to 1.2 V (1,200,000 dgt.).
For a 120,000 dgt. display, corresponds to 1.2 V (120,000 dgt.).
For a 12,000 dgt. display, corresponds to 1.2 V (12,000 dgt.).
For a display in excess of 1.5 V, fixed at 1.5 V.
Maximum output voltage 5 V
Output impedance 1 k
Ω
Number of bits 12bit
Output accuracy Add ±0.2%f.s. to the resistance measurement accuracy
(temperature coefficient: ±0.02%f.s./°C)
Response time Measurement time + Max. 1 ms
Shortest
2.0 ms (tolerance: ±10%±0.2 ms)
Shortest conditions INT trigger source, LP: OFF, 1000 k
Ω
or lower range,
Measurement speed: FAST, Delay: 0 ms,
Self-Calibration: MANUAL
GND端子（黒）
出力端子（赤）
1kΩ
5V
GND （接地）
5 V
1 k
Ω
Output terminal (+)
GND terminal (GND)
GND (earth)