Table of Contents
Advertisement
Test frequencies:
Over five hundred test frequencies between 12 Hz
and 200 kHz may be selected by keyboard entry.
These are:
f = 200 kHz/n, where n = 1 to 13
f = 60 kHz/n, where n = 4 to 256
f= 3 kHz/n, where n = 13 to 250
For example frequencies that can be selected:
200 kHz/1 = 200 kHz
200 kHz/2 = 100 kHz
....
200 kHz/13 = 15.384.6 kHz
If the exact frequency selected is not available, the
nearest available frequency is used. The accuracy of
the test frequency is better than .01%.
Applied Voltages:
5 mV to 1.275 V (programmable in 5 mV steps).
The open circuit voltage accuracy is (5% + 2mV)
(1 + .001f
) where f is the frequency in kHz.
2
This voltage has a source impedance that depends
on the range. A CONSTANT VOLTAGE mode can
be selected which provides a low source impedance
(25 ohms) in order to maintain a constant ac test
level over a wider impedance range.
Source Resistance/
Range
Impedance
1
2
3
4
Constant Voltage
Table-B: Range versus internal source
resistance
The programmed level is obtained under an open
circuit condition. The actually applied voltage can
be determined as follows.
A source resistance (Rs, internal to the meter) is
effectively connected in series with the AC output
and there is a voltage drop across this resistor. When
a test device is connected, the voltage applied to the
device depends on the value of the source resistor
(Rs) and the impedance value of the device. As an
example, where Range 4 is used which has a source
impedance Rs of 25 ohms and the programmed
voltage is 1 V but the voltage to the DUT is 0.5 V.
Abbreviated Specifications
97.4 kΩ
6.4 kΩ
400 Ω
25 Ω
25 Ω
Figure-A: Source Impedance Factors
Internal dc bias is 2 V. External dc bias of up to
60 V may be applied.
Calibrations
An OPEN circuit zero calibration can be performed
to remove the effects of stray capacitance and
conductance shunting the internal test fixture or any
other fixture or cable connection . A similar SHORT
circuit zero calibration can be performed to remove
the effects of resistance and inductance in series in
the test connections . New zero calibrations should
be made to obtain best accuracy whenever the test
frequency or the fixture geometry is changed. A
complete recalibration of the internal standards
for each measurement range may be performed by
using the optional 1689-9604 Calibration Kit and
either a 1689-9600 Test Fixture.
Impedance Ranges:
The direct reading display ranges for R, L. C, G,
|Z| and |Y| are given in Table A. These ranges may
be extended by using the RATIO mode which
multiplies or divides the measured result by an
entered number but does not display a unit. These
extended ranges are also shown. These ranges
exceed by far any practical values and the accuracy
capability of the instrument. The D and Q ranges are
not changed by the RATIO mode, nor is the range of
R when displayed with C, X with R or B with G.
1693 RLC Digibridge
xv
Advertisement
Table of Contents
