Fluke 2625A, 2635A service manual Totalizing Inputs

Introduction and Specifications 1

Specifications

Table 1-4. 2635A Specifications (cont)

Maximum Autoranging Time (Seconds per Channel)
Function	Range Change	Slow

Fast

VDC

VAC

Ohms

Totalizing Inputs

Input Voltage

300 mV to 150V

150V to 300 mV

300 mV to 150V

150V to 300 mV

300Ω to 10.0 MΩ

10.0 MΩ to 300Ω

30V maximum -4V minimum

2V peak minimum signal

0.25

0.25

1.40

1.40

1.70

1.50

0.19

0.18

1.10

1.10

0.75

0.60

Isolation	None
	dc-coupled
Threshold	1.4V
Hysteresis	500 mV
Input Debouncing	None or 1.75 ms
Rate	0 to 5 kHz with debouncing off
Maximum Count	65,535
Digital Inputs
Input Voltage	30V maximum
	-4V minimum
Isolation	None
	dc-coupled
Threshold	1.4V
Hysteresis	500 mV
Trigger Inputs
Input Voltages	contact closure and TTL compatible
	"high" = 2.0V min, 7.0V max
	"low" = -0.6V min, 0.8V max
Isolation	None
	dc-coupled
Minimum Pulse Width	5 μs
Maximum Frequency	5 Hz
Specified Conditions	The instrument must be in the quiescent state, with no interval scans in
	process, no commands in the queue, no RS-232 or IEEE interface activity,
	and no front panel activity if the latency and repeatability performance is to
	be achieved. For additional information, refer to Section 5.
Maximum Latency	Latency is measured from the edge of the trigger input to the start of the first
	channel measurement for the Specified Conditions (above).
	540 ms for fast rate, scanning DCV, ACV, ohms, and frequency only
	610 ms for fast rate, scanning any thermocouple or 100 mV dc channels
	500 ms for slow rate, scanning DCV, ACV, ohms, and frequency only
	950 ms for slow rate, scanning any thermocouple or 100 mV dc channels
Repeatability	3 ms for the Specified Conditions (above)

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