ES51981
3 1/2 AUTO DMM
3.2 Range
RANGE pin switches to and from automatic and manual mode, and while in manual
mode, changes the full scale range. The following figure shows the state transition.
1 push < 1 sec
Automatic
Mode
Manual
Mode
1 push > 1 sec
Range up
1 push < 1 sec
Measurement Mode
V(DC/AC)
Auto
VR2 – VR5
Manual
Control Range
200.0mV – 2000V
Initial Range
2.000V
VRi
VRi
VR5
→
+
→
1,
VR1
µA(DC/AC)
R1 – R2
R1－R2
R1 – R2
200.0µA - 2000µA
200.0µA
20.00mA
R1 → R2,
R2 → R1
R1 → R2
R2 → R1
R1 → R2,
R2 → R1
fixed
mA
(AC/DC)
20.00mA –
200.0mA
Auto A(DC/AC)
2.000A – 20.00A
20.00A
2.000A
20.00A
A(DC/AC)
fixed
ORi
→
Ω
OR1- OR6 ORi
+
1,
200.0Ω – 20.00MΩ
200.0Ω
OR6 → OR1
Continuity
Diode
fixed
Fixed
fixed
fixed
200.0Ω
2.000V
200.0Ω
2.000V
Note: Pushing RANGE resets all existing special modes.
3.3 KEY
See Section “Measurement Mode Switching” for the function of this pin.
4. Serial Data Output
The serial data sent to SDO pin twice every A/D conversion cycle. The data format
complies with JIS 7Bits transmission code with a baud rate of 19230. The host can use
RS232 interface to read the data. A single data packet includes a start bit (always 0), 7
data bits, an odd parity check bit, and a stop bit (always 1). The high and low voltage
levels correspond to DGND and V- respectively. SDO remains at 1 (high) when it is
inactive. Hence the start bit (0) could be used as the triggering signal to begin the
reading process. The following figure shows the data format of a single packet. The
LSB is sent first and the MSB is sent last.
11
08/09/09
CYRUSTEK [ Cyrustek corporation ]
