Fluke 12 Service Manual

10, 11, 12 Multimeters
Service Manual
2-6
Table 2-2. U1 Pinout Table (cont)
Pin
No.
Pin Name Description
34 AMPS Shunt resistor sense pin. Unused in Fluke series 10.
35 ISRC Current source pin for continuity, ohms, and capacitance.
36 SWS Slide-switch position sense pin. Internal pull down.
37 OHMS Ohms sense resistor input pin. Sense voltage at J2.
38 VSS Negative power supply voltage (-3V relative to DGND).
39 ACV AC volts input pin from 10 MΩ resistor.
40 APV0 DC volts input pin from 10 MΩ resistor.
41 DIVLO Input divider (Z1) common (low) pin.
42 APV1 10-to-1 voltage divider and 1 MΩ reference resistor input.
43 APV2 100-to-1 voltage divider and 100 kΩ reference resistor input.
44 APV3 1000-to-1 voltage divider and 10 kΩ reference resistor input.
45 APV4 10,000-to-1 voltage divider and 1 kΩ reference resistor input.
46 DGND Ground power supply pin connected to common (digital ground).
47 DATA3 Most significant bidirectional data bus line.
48 DATA2 Bit 2 of parallel data bus.
49 DATA1 Bit 1 of parallel data bus.
50 DATA0 Least significant bidirectional data bus line.
51 N/C No connection.
52 BEEPER(L) One of two beeper drive lines. Voltage swings VDD to VSS.
53 VSS Negative power supply line (-3V relative to DGNG).
54 VSS Negative power supply line (-3V relative to DGNG)
55 CLK System clock line from U2. 131,072 Hz.
56 BCLK Beeper frequency (2.3 kHz) clock line from U2.
57 TESTCLK Test clock pin for U1 testing.
58 BEEPER One of two beeper drive lines. Voltage swings VDD to VSS.
59 N/C No connection.
60 WRITE(L) When driven low (VSS), data is written to addressed register.

Fluke 12 Specifications

General

Continuity Beeper	Yes
Diode Test	Yes
Safety Rating	CAT III 600 V
Operating Temperature	0 °C to 50 °C
Display Type	LCD
Voltage DC	600V
Voltage AC	600V
DC Current Range	10 A
AC Current Range	10 A
Resistance Range	40 MΩ
Battery Type	9V
Dimensions	169 mm x 84 mm x 44 mm