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4.10 Calculation of ΔT from Stored Data
The coefficient ΔT is used to calculate the insulation resistance at a temperature
other than the measurement temperature. It is the temperature difference at which
the insulation resistance concerned is divided by 2.
This coefficient is variable and depends on the type of insulation. When it is not
known, the instrument can calculate it from three or more stored measurements.
NOTE: These 3 measurements must have been made on identical insu lation but at 3 different temperatures, and the temperatures must have
been recorded using the 2nd + TEMP buttons at the same time as the
measurements, without applying the correction (Resistance Correction
OFF).
• In the SET-UP mode, select “Calculate ΔT from Memory” and press the
► button. The display shows all values recorded with a temperature.
• Select at least 3 measurements using the ▲ , ▼ , ◄ , ► buttons.
• ΔT is calculated and recorded automatically once 3 stored measurements have been selected, and will be updated if more measurements
are selected.
• The larger the number of measurements, the more accurate the calculation of ΔT.
NOTE: This calculation is available only for resistance values < 200GΩ.
SET-UP
Instr.Nr. 9600004
SW Version 1.2
Calculate ∆T from Memory
Maxumum Output Voltage
5100V
Set Default Parameter
Clear Memory
V Disturbance / V Output
10%
Buzzer
on
Power Down
on
Baud Rate
9600 / RS232 Megohmmeter Model 5070
SET-UP
∆T Calculation for R/2
Obj. Test
Res.
Volt.
47
13
13
02
02
02
99
59
58
03
02
01
228.5MΩ
208.5MΩ
178.5MΩ
328.5MΩ
328.5MΩ
328.5MΩ
5078V
5078V
5078V
5078V
5078V
5078V
23.7°C
Temp.
23°C
30°C
37°C
23°C
23°C
23°C
53