PeakTech 4000 Use and care manual

Procedure of calibration for PeakTech®4000
1. Checking its basic functions
Place the rotating switch on the AC Volt position when the power supply is turned on. All of the
buttons shall display and sound properly when you press them. The sound and loudness from the
buzzers shall be mellow and sonorous. VFD shall display the correct symbol when you place the
switch on every tested position. Table 1 shows the symbols displayed when the switch is placed
on every position.
Table 1: symbols displayed on LCD when the switch is placed on every position (note: it is
possible that the ‘-‘ in bracket isn’t displayed)
Position Symbol Position Symbol
AC Volt AC, AUTO, V, VOLT Capacitance AUTO, nF,
DC Volt DC, AUTO, V, VOLT, (-) µA DC, AUTO,µA, AMP,(-)
mV DC, AUTO, mV, VOLT, (-) mA DC, AUTO, mA, AMP,(-)
Logic frequency AUTO, Hz, FREQ A DC, AUTO, A, AMP,(-)
Diode V,
Resistance AUTO, MΩ, OHM
2. Entering into the Calibration Mode
Firstly press and hold the Calibration button on the bottom of the meter. Switch on the meter; and
then release the Calibration button immediately. The meter will enter in the Calibration Mode. Its
feature is that the meter will immediately enter into the Manual range (the MANUAL displayed)
when it is turned on; but it will enter into the AUTO range (the AUTO displayed) if it isn’t in the
Calibration mode.
3. Zeroing
Press the ~Hz button. Now the applications in the meter will perform the zeroing process
automatically. However, the zeroing will not be performed until its digitals have been displayed
stably. Otherwise, zero drift will take place when the zeroing has finished. The zeroing for every
range corresponding to the positions shall be performed. When performing the zero, the inputs
shall be short or open depending on the positions. For the AC voltage and current, waiting time
for digital display is so longer that the zeroing shall not be performed until the digitals has been
displayed. Otherwise, precise zeroing cannot be achieved. To reduce waiting time and increase
the efficiency, you may use the method that a batch of meters will be zeroed. Table 2 shows the
modes, ranges and input conditions corresponding to every position required to be zeroed.
4. Calibrating the ranges
The range shall not be calibrated until the zeroing has finished. When calibrating the meter,
different standard signals (or standard elements such as resistance and capacitance) shall be
input (or connected) depending on the positions and ranges. Then press the HOLD button when
the digitals on the meter have been displayed stably. Now the applications in the meter start to
perform the calibration automatically. If the meter displays the OL when these signals (or
elements) are input (or connected), press the HOLD button firstly. When the digitals are displayed
stably, press the HOLD button one time. When pressing the HOLD button, the digitals on meter
shall be basically equal to standard signals or element values (the difference shall not exceed 2
numbers). If the difference is too bigger, press and hold the HOLD button until the digital is
basically equal to the signal or value. The table 3 shows the modes, ranges and input
corresponding to the positions required to be calibrated. Since the capacitance for high frequency
compensation can affect on the measure of capacitance, the calibration on the capacitance can be
performed only when the calibration on high frequency compensation has finished. When
calibrating the resistance range of 50MΩ, firstly connect 40MΩof standard resistance, and then
press the HOLD button. When the LCD displays the E, This resistance shall be replaced with
20MΩof standard resistance, and then press the HOLD button.

Table 2: the schedule of the zeroing for PeakTech®4000
5. Position Mode (by the Select
button)
Range (by the
Range button)
Input condition Method
5V
50V
500V
ACV N/A
1000V
Short between the
VΩHz and COM
Press the ~Hz
button
5V
50V
500V
DC
1000V
5V
50V
500V
DCV
AC
1000V
Short between the
VΩHz and COM
Press the ~Hz
button
50mV
DC 500 mV
50 mV
mV
AC 500 mV
Short between the
VΩHz and COM
Press the ~Hz
button
Logic frequency
()
Diode ( ) N/A N/A
Short between the
VΩHz and COM
Press the ~Hz
button
500Ω
5KΩ
50KΩ
500KΩ
5MΩ
Resistance (Ω) N/A
50MΩ
Short between the
VΩHz and COM
Press the ~Hz
button
50nF
500nF
5µF
50µF
500µF
Capacitance
N/A
5000µF
All of inputs shall
be open.
Press the ~Hz
button
500µADC
5000µA
500µA
µA AC
5000µA
Short between
theµA/mA input
and COM
Press the ~Hz
button
50mADC
500mA
50mA
mA AC
500mA
Short between
theµA/mA input
and COM
Press the ~Hz
button
5ADC
10A
5A
A AC
10A
Short between the
A input and COM
Press the ~Hz
button

Table 3: the schedule of range calibration for PeakTech®4000
Position
Mode (by the
Select button)
Range (by the
Range button)
Standard
signal and
element value
Signal output Calibration
Method
5V ~4V/60Hz
ACV N / A 50V ~40V/60Hz VΩHz port
500V ~400V/60Hz COM port
1000V ~800V/60Hz
5V +4V
DC 50V +40V
500V +400V
The VΩHz
1000V +800V shall be
DCV 5V ~4V/60Hz connected to”+”
AC 50V ~40V/60Hz signal and the
500V ~400V/60Hz COM to “-“
1000V ~800V/60Hz signal
DC 50mV +40mV
mV 500mV +400mV
AC 50mV ~40mV/60Hz
500mV ~400mV/60Hz
Logic
frequency
()
Diode
()
N / A N / A +1,5V The VΩHz shall be
connected to “+”
signal and the
COM to “-“ signal
500Ω400Ω
5kΩ4kΩ
Resistance N / A 50kΩ40kΩVΩHz port
(Ω) 500kΩ400kΩCOM port
5MΩ4MΩ
50MΩ40MΩ/ 20MΩ
50nF 40nF
500nF 400nF
The VΩHz shall be
Capacitance N / A 5µF 4µF connected to”+” of
50µF 40µF Capacitance, the
500µF 400µF COM to “-“
5000µF 1000µF
DC 500µA +400µA
µA 5000µA +4000µA
AC 500µA ~400µA/60Hz The µA/mA shall
be
5000µA ~4000µA/60Hz connected to”+”
DC 50mA +40mA signal and the
mA 500mA +400mA COM to “-“signal
AC 50mA ~40mA/60Hz
500mA ~400mA/60Hz
DC 5 A +4 A The A shall be
A 10 A +8 A connected to “+”
AC 5 A ~4 A/60Hz signal and the
10 A ~8 A/60Hz

5. Calibrating high frequency
High frequency may be calibrated only when the meter is in the normal operating conditions rather
than the Calibration mode. Only AC Volt position shall be calibrated for high frequency; high
frequency performance on other positions shall be ensured by means of the circuits. Parts of
compensation capacitances (C4, C5, C6, C7) have been soldered into the circuit board where
retains four positions (C4, C5, C6, C7) for soldering four additional capacitances. Compensation
capacitances corresponding to the ranges for AC Volt position are shown in Table 4.
Table 4: AC range and compensation capacitance
Range 5V 50V 500V 1000V
Compensation
capacitance
C4, C4’ C5, C5’ C6, C6’ C7, C7’
The calibration for high frequency shall be performed according to different frequency signals. Testing
signals at every frequency for ranges shall be full and 1/10 range. Testing signals and their tolerated
errors are shown in Table 5.
Table 5: High frequency performance on the ranges of AC Volt position
Range Testing signal Error Range Testing signal Precision
1KHz ±0.4%
10KHz ±0.8%
~50V
~500V 1KHz ±0.4%
~50V
~300V 10KHz ±0.8%
5V ~0.5V
~5V 20KHz ±1.2%
500V
1KHz ±0.4% ~100V
~1000V 1KHz ±0.4%
10KHz ±0.8%
50V ~5V
~50V
20KHz ±1.2%
1000V
Compensation capacitance corresponding to the ranges shall be increased if there is an error in the
positive direction under the 10Khz or 20KHz of frequency (the value displayed is greater than that of
signal), and the error is close to or reaches specified precision. The capacitance shall be decreased if
there is an error in the negative direction under such frequency (the value displayed is less than that of
signal), and the error is close to or reaches specified precision. When testing it, firstly input 20KHz of
frequency for testing. The 10KHz and 1KHz generally meet the requirements if the 20KHz is
acceptable.
6. Calibrating the Capacitance position
When the calibration for high frequency compensation has finished, you may begin to calibrate the
Capacitance position. The meter shall be in the Capacitance mode. The range of capacitance
shall be calibrated according to section 5 and Table 3.
7. Initializing the memory
In the Capacitance mode, press the ∆REL button for about 2s. Now The MEM appears on the
VFD. This means that 30 areas have been allocated properly, i.e, the initialization of memory has
finished. Switch off the meter and then restart it. By pressing the MEM button, store current
messages and displays them on the No.1 memory area. By pressing the VIEW button, return to
the No.1 memory area and display the messages that are saved just now.
8. Checking the Logic frequency/duty ratio
Press the logic frequency( ) button. Input the about 2.5V of logic square wave into the VΩHz
and COM ports, where the COM is connected to the grounding and the VΩHz connected to high
level. Adjust the frequency of wave from 5Hz to 2MHz. Now the meter shall display normally the
frequency (its precision shall be ±(0.006%+2)). If the larger frequency error is displayed, you shall
consider replacing the 4MHz crystalloid beside the U1.

9. Measure and check of linear frequency
i. Place the switch on the AC Volt (~V) position and 5 V range. Input the 500mV/200KHz of
signal into the VΩHz and COM ports. By pressing the ~Hz button, the meter shall display
proper frequency at second section and the error shall be ±3 (±0.006%±2). Decrease the
frequency into the 10Hz (the magnitude shall be constant). Now the meter shall display
correctly. Finally, switch off the output from the signal source.
ii. Place the switch on the mV position. Input the 4mV/200KHz of signal into the VΩHz and
COM ports. By pressing the ~Hz button, the meter shall display proper frequency and the
error shall be ±3(±0.006%±2). Decrease the frequency into the 10Hz (the magnitude shall
be constant). Now the meter shall display correctly. Finally, switch off the output from the
signal source.
iii. Place the switch on theµA position. Input the 40µA/10KHz of current signal into the
µA/mA and COM ports. By pressing the ~Hz button, the meter shall display proper
frequency and the error shall be ±3(±0.006%±2). Decrease the frequency into the 5Hz
(the magnitude shall be constant). Now the meter shall display correctly.
Note: If the ~Hz cannot be displayed, check the elements such as R41, C21.
10. Checking the RS232C infrared port
Connect the RS232-C cable from the meter to the PC. Run the application for receiving data in
the PC. Press the HOLD button for 2 second, and then release it. Now the meter starts to transfer
the data to the PC while the on the VFD screen has been illumined. The data on the
PC shall be consistent with that on the meter. Press the HOLD button for 2s, and then release it.
Now the meter stop transferring the data while the symbol has extinguished. The data
in the PC will not change again. If the communication between the PC and meter cannot be
achieved, replace the cable and infrared port and then attempt such operations again. If the data
cannot be transferred check the R50, R51, Q7, D10 and their groundings.
11. Checking the alarm for the Current position
Insert the meter pen into the µA/mA jack. The buzzer shall sound when the switch is placed on
any position except for the µA and mA position. Insert the pen into the A jack. The buzzer shall
also sound when the switch is placed on any position except for the A position.