ES51927
6000 Counts Smart DMM
10
11
12
13
14
15
16
17
18
19
20
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
I
I
I
Low current measurement input
Input high voltage for resistance/capacitor measurement
Output connection for resistance/capacitor measurement
Sense low voltage for resistance measurement
Reference resistor connection for 600.0Ω range
Voltage measurement ÷10000 attenuated (1000V)
Voltage measurement ÷1000 attenuated (600.0V)
Voltage measurement ÷100 attenuated (60.00V)
Voltage measurement ÷10 attenuated (6.000V)
I
O
O
O
O
O
TEST5
ACVL
I/O Test pin
I
DC signal low input in ACV/ACA mode. Connect to negative output of
external AC to DC converter.
21
ACVH
I
DC signal high input in ACV/ACA mode. Connect to positive output of
external AC to DC converter.
22
23
24
25
26
27
28
29
30
31
32
33
ADI
ADO
I
O
O
O
O
O
-
O
I
I
Negative input of internal AC to DC OP Amp.
Output of internal AC to DC OP Amp.
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
OHMC4
OHMC3
OHMC2
OHMC1
NC
VRH
VR
SGND
ADP
VA+
Output of band-gap voltage reference. Typically –1.2V
Reference input voltage connection. Typically –400mV
Signal Ground.
Measurement input in ADP mode
For ADP mode. De-integrating voltage positive input. The input should
be higher than VA-.
I
I
34
VA-
I
For ADP mode. De-integrating voltage negative input. The input should be
lower than VA+.
35
36
VR1
NC
I
-
Measurement input.
37
38
CA-
CA+
I/O Negative auto-zero capacitor connection for capacitor measurement
I/O Positive auto-zero capacitor connection for capacitor measurement
39
40
41
42
43
44
45
46 – 50
51
R9K
R1K
O
O
O
I
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Sleep mode indicator, asserts low in SLEEP mode. Normal V+ output.
Pull to V- to enable the BUZOUT.
Auto power off idle time selection.
Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
Output to V- when AC mode inactive and output to V+ in AC mode.
SLEEP
BUZIN
APOSEL
BUZOUT
ACEN
NC
I
O
O
-
BKOUT
O
If BKLIT function is enabled, this pin will change from –3V to +3V
for 60 sec, once press BKLIT pin again within 60 sec, this pin will change
back to –3V.
52
ANNUNC
O
Square wave output at the backplane frequency, synchronized to BP1.
ANNUNC can be used to control display annunciator. Connect a LCD
segment to ANNUNC to turn it on; connect an LCD segment to its back
plane to turn it off.
53
54
55
56
57
58
59
60
BP4
BP3
BP2
O
O
O
O
I
I
-
I
LCD backplane 4
LCD backplane 3
LCD backplane 2
LCD backplane 1
Pull-low to enable non-contact AC voltage detection
Back light function. Pulse low to set BKOUT pin output.
BP1
EFEN
BKLIT
NC
RANGE
Pulse to V- to enable manual mode and manual range selection.
Ver 2.9
3
10/06/25
CYRUSTEK [ Cyrustek corporation ]
