Agilent Technologies D, 66311B, 66309B, 66111A manual

3 - Installation

NOTE: The DVM is not designed to measure voltages that are greater than +25 Vdc or less than −4.5 Vdc with respect to the negative terminal of the main output. The following sections discuss restrictions that apply when using the DVM to measure voltages on circuits that are not powered by the main output, or that are floating with respect to the main output.

Measuring Circuits that are Not Powered by the Main Output

To obtain correct voltage measurements, keep the common mode voltage within the specified limits. Common mode voltage is defined as the voltage between either DVM input terminal and the negative terminal of the main output (output 1). The common mode voltage range is from −4.5 Vdc to +25 Vdc. Attempting to measure voltages outside this range may result in incorrect readings due to clipping by the internal DVM measurement circuits.

NOTE: Do not confuse the common mode voltage with the DVM voltage readback. The DVM voltage readback is a differential measurement from one input lead to the other input lead. This quantity may be as high as ±25 Vdc, depending on the orientation of the input leads.

Because the measurement circuits of the DVM are internally referenced to the minus terminal of the main output, you must observe the following restrictions in order to guarantee accurate DVM measurements (refer to figure 3-8).

Test Fixture(for illustration only)

		1
	DVM	R1
	DVM	12V
		12V
Agilent 66309D
Agilent 66311D		2
DVM INPUT
	DVM	R2	36V
	DVM	12V	36V
		12V	DC
			DC
	lead resistance	3
		3
+	load
	current
OUTPUT	LOAD	R3
OUTPUT	LOAD	12V
		12V
Minus −	− V +	4
terminal	lead resistance
	lead resistance
		R4
		2V
		5
	DVM	R5	6V
	DVM	2V	6V
		2V	DC
			DC
		6
	DVM	R6
	DVM	2V
		2V

Node # V Common Mode

136 V + V

224 V + V

312 V + V

5- 2 V + V

6- 4 V + V

7- 6 V + V

NOTE: The DVM common mode voltage range is from -4.5Vdc to +25Vdc. voltages outside this range will result in erroneous readings.

Figure 3-8. Measuring Circuits Not Powered by the Main Output

66111A, 66309B, 66311B, D specifications

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Agilent Technologies D, 66311B, 66309B Measuring Circuits that are Not Powered by the Main Output

Models: 66111A 66309B 66311B D

Measuring Circuits that are Not Powered by the Main Output

Agilent 66309D

Agilent 66311D

Figure 3-8. Measuring Circuits Not Powered by the Main Output

66111A, 66309B, 66311B, D specifications