Tonghui TH2816B - Deviation Measurement Function

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2) Press ON to set the level monitor function to ON. Press OFF to set the level
monitor function to off.
4.3.3.6 Deviation Measurement Function
The deviation measurement function allows you to display the deviation value instead
of the actual measurement value. The deviation value is the value calculated by
taking the difference between the actual measurement value and a previously stored
reference value. This function is useful when the change of a component's value
versus changes in temperature, frequency, bias, etc. are being observed. Deviation
measurements can be made for either or both primary parameter and/or secondary
parameter measurements. There are two types of deviation measurements.
 ΔABS (Delta ABSolute) deviation measurement
The difference between the measured value of the DUT and a previously stored
reference value are displayed. The formula used to calculate the deviation is as
follows.
ΔABS = X-Y
Where, X: The measured value of DUT.
Y: The stored reference value.
 Δ% (Delta percent) deviation measurement
The difference between the measured value of the DUT and a previously stored
reference value are displayed as a percentage of the reference value. The
formula used to calculate the percent deviation is as follows.
Δ% = (X-Y)/Y×100%
Where, X: The measured value of DUT.
Y: The stored reference value.
Perform the following steps to execute the deviation measurement function.
1) Move the cursor to the REF_A field to enter the reference value for the primary
parameter. The following softkey will be displayed.
 MEAS
When the device which has a reference value is connected, pressing this
MEAS softkey, TH2816B measures the device, and the primary
measurement result is entered as a reference value for REF_A.
2) Enter the reference value for the primary parameter using MEAS or the numeric
entry keys.
3) Move the cursor to the REF_B field to enter the reference value for the secondary
parameter. The following softkey will be displayed.
 MEAS
When the device is to be used as the reference value is connected, MEAS is
pressed, TH2816B measures the device, and the secondary measurement
result is entered as a reference value for REF_B values.
4) Enter the reference value for the secondary parameter using MEAS or the
numeric entry keys.
5) Move the cursor to the DEV_A field. The following softkeys will be displayed.
 Δ%
 ΔABS
 OFF
6) Select and press a softkey to select the deviation mode for the primary parameter.
7) Move the cursor to the DEV_B field. The following softkeys will be displayed.
 Δ%
 ΔABS
 OFF
8) Select and press a softkey to select the deviation mode for the secondary
parameter.