Operator`s manual

31 Signametrics

“Specifications” for details.). When measuring RMS values, there is no point setting the Read Interval (1/rate) to a

value shorter than 0.16s since the RMS circuitry has a settling time that is greater.

Range: Can be set to Autorange or manual by clicking on the appropriate range in the lower part of the Windows

panel. Autoranging is best used for bench top application and is not recommended for an automated test

application due to the uncertainty of the DMM range, as well as the extra time for range changes. Locking a range

is highly recommended when operating in an automated test system, especially to speed up measurements. Another

reason to lock a range is to control the input impedance in DCV. The 240 mV and 2.4 V ranges have virtually

infinite input impedance, while the 24 V and 240 V and 330 V ranges have 10 MΩ input impedance.

S_Cal: This function is the System Calibration that corrects for internal gain, scale factor and zero errors. The

DMM does this by alternatively selecting its lo l DC reference and a zero input. It is required at least once every

ay to meet the SM2060 accuracy specifications. It is recommended that you also perform this function whenever

e external environment changes (e.g. the temperature in your work environment changes by more than 5°C, or the

M2064 on board temperature sensor indicates more than a 5°C change). This function takes less than a few

conds to perform. Disconnect all leads to the DMM before doing this operation. Keep in mind that this is not a

bstitute for periodic calibration, which must be performed with external standards.

losedLoop: This check box selection is used in conjunction with the AC and DC Voltage-Source functions of the

M2064. When checked, the DMM monitors the output level and continuously applies corrections to the output

vel. When not checked, the DMM is a 12-bit source vs. 16 bits in the ClosedLoop mode.

penCal: This check box selection is used in conjunction with inductance measurement. It is necessary to perform

pen Terminal Calibration using this control, prior to measuring inductance. This function characterizes both the

ternal DMM circuitry as well as the probe cables. To perform OpenCal, attach the probe cables to the DMM,

enCal button.

leaving the other end of the probe cables open circuited. Then, activate the Op

Sources Panel:

There are three function buttons in the Source group (SM2064 only). The V, I, LEAK buttons

select one of three source functions, Voltage (DC and AC), IDC and Leakage. The Sources Panel is automatically

enabled when one of the source functions is enabled. It can also be invoked using the Sources Panel selection

under the

Tools menu. This panel allows the entry of values for all of the source functions, including Leakage.

The V-OUT Scroll bar and Text box are used to

set the Voltage for DC and AC Volts as well as

for Leakage. When sourcing ACV, the voltage is

used to control inductance frequency. When

, use the I-OUT set of

hen measuring timing or freqeuncy

in RMS and the FREQ. Scroll bar and Text box

control the frequency of the source. It is also

sourcing DC current

controls. W

the THRESH set of controls is used for

comperator threshold. All of the source controls

are context sensitive and will be enabled when