Dostmann Electronic P795 Operation Manual

DOSTMANN electronic

DOSTMANN electronic GmbH

SERIE

P700

P795

Precision 2-channel hand-held measuring instrument

Operation Manual

1.4.4 Channel activation (only 2-channel instruments) / [Chnl]

Chnl = Channel

To activate or deactivate a measuring channel push [ENTER/
MENUE]. Use the up and down keys

[]

to select Chnl. Push
again [ENTER/MENUE]. On the left corner of the display appears a
small 1, which indicates the selected channel. To change the chan­nel use the up and down keys

[]

. Push [ENTER/MENUE] to con-

firm. Use the up and down keys

[]

again to activate on or deacti­vate off the requested measuring channel and push [ENTER/MENUE]
to confirm. Push [ESC] to revert back to the measuring mode.

Note: As a minimum one channel is active!

1.4.5 Memory Setup Lo6

Push [ENTER/MENUE] and use the up and down keys

[]

to select

Lo6. Push [ENTER/MENUE] to confirm. Use the up and down keys

[]

again to start [on] or Stop [off] the logger. Push [ENTER/

MENUE] to confirm. Use the up and down keys

[]

again to select
between automatic storage [Auto] or manually operated storage
[SPot]. Push [ENTER/MENUE] to confirm]. Use the up and down keys

[]

again to select between to add on data [Add] and creating a
new file [nLo6]. Push [ENTER/MENUE] to confirm. By selected auto­matic storage at the end you have to select the time interval:

1 S 1 second
5 S 5 seconds
10 S 10 seconds
20 S 20 seconds
30 S 30 seconds
1 M 1 minute
2 M 2 minutes
5 M 5 minutes
10 M 10 minutes
20 M 20 minutes

By selected manually operated storage you are able to save the
measurement by pressing ESC by each time.
Push [ENTER/MENUE] to confirm. Push [ESC] to revert back to the
measuring mode.

E.g. of the instrument’s LCD by activated logging mode:

On the bottom you can see the percentage of the
occupied memory (0..99%). If a calibration option
is activated the display is alternating between
displaying memory status and calibration infor­mation.

1.5 Recalling the memory data (HOLD MAX MIN AVE)

After pushing first time the key [HOLD MAX MIN AVE] the actual val­ues will be held on the display. Pushing again the key [HOLD MAX
MIN AVE], the saved maximum-, minimum and average values will be
displayed.

Note: During the recall of the memory data the extremes (MAX MIN)

and the average value (AVE) will not be calculated or carried on.

Clearing the memory (MAX MIN AVE)

Press [CLEAR] key once to erase the stored maximum, minimum and
average from memory. On the display appears Clr. – After erasing the
memory the instrument automatically reverts back to measuring mode
indicating the actual measured value again.

1.6 Measuring rate
(Normal-Mode / FAST-Mode / Filter-Mode)

The instrument has three different response times to select:

Normal-Mode: high resolution

(0.001 from -199.999 to +199.999)

FAST-Mode: reduced resolution

(0.01 from -199.99 to +199.99)

Filter-Mode: high resolution

(0.001 from -199.999 to +199.999)

Press [FAST/



] key to change the measuring rate.
By using the Filter-Mode the instrument is performing a moving aver­age to stabilize the dispayed measurements. After turning on the
instrument it is in the Normal-Mode. After pressing once the [FAST/]
key the instrument switches to the Fast-Mode. Pressing the same key
once again the instrument switches to the Filter-Mode.

E.g. Display with activated Filter-Mode:

The arrow on the top indicates that the instru­ment is working in the Filter-Mode.

Note: After switching off the instrument, this function is automatically

deactivated.

1.7 AUTO-OFF-function

dAoF = Disable Auto-off
EAoF = Enable Auto-off

Press [ESC/AUTO-OFF] key once. On the display appears EAoF.
Now the instrument switches off automatically after app. 30 minutes.
Press [ESC/AUTO-OFF] key again. On the display appears dAoF.
Now the Auto-Off-function is deactivated.

Attention: This setting will be deactivated when the instrument turns

off. (Standard setting is EAoF).

1.8 TARE-Function (ZERO-Mode F1)

The Instrument has a special Tare/Zero-button. Pressing the [F1] key
once, the instrument will subtract the last measured value from the
actual measured value. So if the measurement does not change
zero appears on the instrument’s display. If you press the [F1] key
once again the instrument move to the Normal-Mode.

E.g. Display with activated Zero-Mode:

The arrow on the left indicates that the instru­ment is working in the Zero-Mode [F1].

Note:

After switching off the instrument, this function is automatically
deactivated.

2. Power supply

• For the power supply of the instrument a 9 Volt dry battery is used.

To exchange the battery switch of the instrument and open the
rear battery cover. Remove the battery from the instrument and
replace with a new battery.

• The “BAT” symbol in the display indicates that the battery needs

to be exchanged. After displaying the “BAT” symbol, the instru­ment allows app. 1 hour of further operation.

• The battery symbol indicates according to the battery status

between 1 to 3 segments.

Attention:

Please do not dispose of old electronic devices and empty batteries
in household waste. To protect the environment, take them to your
retail store or to appropriate collection sites according to national
or local regulations.

3. Error Codes

By displaying the following error codes the instrument support the
operation of the instrument:

Error Meaning

oPEn no probe

or wrong probe is connected

|

­oLo „too low“

underflow of the measuring range

|

­oHi „too high“

exceeding of the measuring range

|

­Er1 temperature of the cold junction

above the measuring range

|

­Er2 temperature of the cold junction

above the measuring range

E15 low battery

(battery is completely exhausted)

E19 low battery

(battery is completely exhausted)

E1d low battery

(battery is completely exhausted)

E16 time out / auto-off-function

E1o time out / auto-off-function

E1e time out / auto-off-function

E23 EE-prom destroyed or

EE-prom index is wrong

E25 EE-prom destroyed or

EE-prom index is wrong

E31 temperature of cold junction

out of range

LoLi internal buffer battery (CR2032) empty

Unit L in2 CAL Chnl Lo6





MENUE

Unit L in2 CAL Chnl Lo6





MENUE

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DOSTMANN electronic

DOSTMANN electronic GmbH

Summary

1. Handling

1.1. General advices

1.2. Setting to work

1.3. Switch on/off

1.4. Menu

1.4.1. Measuring unit switching (Unit)

1.4.2. Difference temperature (L in2)

1.4.3. Calibration (CAL)

1.4.4. Channel activation (Chnl)

1.4.5. Memory setup (Lo6)

1.5. Recalling memory data (HOLD/MAX/MIN/AVG)

1.6. Measuring rate (FAST-mode)

1.7. AUTO-OFF-function

1.8. TARE-Function (ZERO-Mode F1)

2. Power supply / Changing the battery

3. Error codes / troubleshooting

1. Handling

1.1 General advices

• For cleaning the instrument please do not use abrasive cleaner but

a dry or wet piece of cloth.

• Please store the measuring instrument in a dry and clean place.

• Avoid any force like shocks or pressure to the instrument.

• Do not use force to connect the probe or interface plugs in. The

interface plug is different from the probe plug.

• If no sensor is connected to the instrument while switching on

“open” shows on the display (Please refer to chapter error codes /
troubleshooting).

• A retractable stand on the back of the instrument allows it to be

used as a bench top instrument.

1.2 Operation

Before switching on the instrument, connect the probe/s to the instru­ment and insert the battery (Please refer to chapter 2. Power
supply/changing the battery). A number on the instrument’s housing
marks each port.

1.3 Switching on and off

By operating the ON/OFF-key the instrument switched on or off. After
switching on the instrument indicates a full segment test for 15
seconds, then it starts to function in measurement mode indicating the
actual measurement value.

1.4 Menu

The adjustments of the instruments function: measurement value,
calibration of probes, deactivation of channels, for example, are
selected from the menu structure. Enter into the main menu by push­ing [ENTER/ MENUE]. Use the up and down keys [



] to select the

required menu. Push [ESC] to revert back to the measuring mode.

Menu structure

1.4.1 Measuring unit switching °C, °F and Resistance (Ohm’s) [Unit]

Unit = Measuring unit

Measuring unit temperature (°C=Celsius, °F=Fahrenheit; o=Ohm)
To change the measuring unit push [ENTER/MENUE]. Use the up and

down keys

[]

to select Unit. Push again [ENTER/MENUE]. On the
right corner of the display appears °C, °F or o. Use the up and down
keys

[]

again to adjust the requested measuring unit and push
[ENTER/MENUE] to confirm. Push [ESC] to be back in the measuring
mode.

1.4.2 Temperature difference (only 2-channel instruments) / [L in2]

To display the temperature difference push [ENTER/MENUE]. Use
the up and down keys

[]

to select L in2. Push again
[ENTER/MENUE]. On the right corner of the display appears a T1-T2.
Use the up and down keys

[]

to adjust the requested selection.
Push [ENTER/MENUE] to confirm. Push [ESC] to revert back to the
measuring mode.

Note: Both channels have to be activated for displaying temperature

difference.

1.4.3 Calibration function / [CAL]

Despite high quality manufacturing techniques, each probe is slightly
different from specified standards. To eliminate inaccuracies
caused by exchanging or ageing of probes, the instrument offer

easy calibration functions which guarantee that the system accura­cy is always as good as if the instrument was specifically calibrated
to the individual probes in our laboratory.

The instruments offer five different calibration options:

1) [CoFF]: Standard characteristic curve

(e.g. Pt100-resistance according EN 60751)

2) [oP 1]: Calibration by code

(2 x four digit code) is equivalent to a 2-point calibration.
The code is marked clearly by a label on each standard
probe.

3) [oP 2]: Calibration by physical standard references

(1-point, 2-point or 3-point calibration)

4) [oP 3]: Calibration according to Coefficients of EN60751 (R0, ABC)

5) [oP 4]: Smart EEprom probes with internal calibration

(AUTO-Detection)

CAL = calibration

Push [ENTER/MENUE] to calibrate the instrument with sensor. Use
the up and down keys

[]

to select CAL. Push again [ENTER/
MENUE]. On the left corner of the display appears a small 1, which
indicates the selected channel. To change the channel (1 or 2) use
the up and down keys

[]

. Push [ENTER/MENUE] to confirm.

Use the up and down keys

[]

to select the requested calibration

option. Push [ENTER/MENUE] to confirm.

1) Standard calibration according to DIN EN 60751 / [CoFF]

Use the up and down keys

[]

to select [CoFF]. Push
[ENTER/MENUE] to confirm. Push [ESC] to revert back to the
measuring mode.

2) Calibrationby code / oP1

Use the up and down keys

[]

to select oP 1. Push [ENTER/
MENUE] to confirm. On the bottom of the display appears a small
1, after this number a four-digit number (Hex-Code/0..F) is dis­played. For changing the number use the up key

[]

. To step to

the next number use the down key

[]

.

If the requested number is complete then push [ENTER/MENUE] to
confirm. At the bottom of the display a very small 2 appears, after
which a second four-digit number is displayed. For changing the
number please follow the manual as before. Push [ESC] to revert
back to the measuring mode.

Note:

After confirming oP 1 by pushing [ENTER/MENUE] the function oP 1
(calibration by code) is activated, even though you leave the menu by
pressing [ESC].

Display-indication with active calibration code (oP 1):

The CAL-segment and the small 1 indicates to the
user that oP 1 is activated.

3) Calibration by physical standard references / oP 2

Use the up and down keys

[]

to select oP 2. Push [ENTER/
MENUE] to confirm. On the bottom of the display appears 1 P. For
changing between a 1-Point [1 P], 2-Point [2 P] or 3-Point [3 P] - cali­bration use the up and down keys

[]

.

Example of a 1-Point calibration:

Push [ENTER/MENUE] to confirm. On the display appears CALC.
After the displayed measuring value is stabile push [ENTER/
MENUE]. On the first display line you can see the “frozen” measure­ment value. On the second line as a default you can see -100.000.
Now you have to enter (instead of -100.000) the correct measure­ment value from your reference:
By using the up key

[]

you are able to move the decimal point to
setup the number of decimal places. Push [ENTER/MENUE] to con­firm.
Now the algebraic sign is blinking "-". Use the up key

[]

to toggle
for positive or negative number. Change the number using the up
and down keys

[]

:



is changing the blinking segment



is jumping to the next segment

Push [ENTER/MENUE] to confirm, revert back to the measuring
mode.

Important:

To abort the physical calibration use the [ESC]-button.

Display-indication with active calibration code (oP 2):

The CAL-segment and the small 2 indicates to
the user that oP 2 is activated.

4) Calibration according to Coefficients of EN60751 (R0, ABC) / oP 3

By using Option 3 you are able to activate coefficients according
to EN60751 (R0, A, B, C). The coefficients have to be calculated
using special software on a PC (e. g. P7_CALC). Before you are
able to activate this option you have to transmit the coefficients
from the PC to the instrument. Therefore you have to use the Soft­ware P7_CALC, too.

Use the up and down keys

[]

to select oP 3. Push [ENTER/
MENUE] to confirm. Now the calibration option 3 is activated!
Push [ESC] to revert back to the measuring mode.

Note: After confirming oP 3 by pushing [ENTER/MENUE] the function

oP 3 (calibration by code) is activated, even though you leave the

menu by pressing [ESC].

Display-indication with active calibration code (oP 3):

The CAL-segment and the small 3 indicates to
the user that oP 3 is activated.

5) Smart EEprom-probes with internal calibration
(AUTO-Detection) / oP 4

The Option 4 will be activated automatically by using Smart
EEprom probes. This option will be activated by switching on the
instrument when the Smart EEprom probe has been connected to
the instrument.

Display-indication with active calibration code (oP 4):

The CAL-segment and the small 4 indicates to
the user that oP 4is activated.

Note:

If a Smart probe will be disconnected during the instrument is work-

ing the instrument automatically switch to the CAL-menu.

❶ Up and down keys
❷ [ESC] key
❸ [ENTER/MENUE] key

❶

❷

❸

Unit

°C

°F

O

L in2 CAL Chnl Lo6

T1-T2 CoFF

oP 1

oP 2

oP 3

oP 4

oFFonoFF

on

Unit L in2 CAL Chnl Lo6





MENUE

Unit L in2 CAL Chnl Lo6





MENUE

1 P 2 P 3 P





oP 2

CoFF oP 1 oP 2 oP 3 oP 4





CAL

Unit L in2 CAL Chnl Lo6





MENUE



Mounting device
for probe handle

Big
LC-Display

Measuring port 2

Retractable stand

USB PC

interface port

Measuring port 1

Keyboard

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