P ANEL

METER

RANGE

CHANGE

KIT

2

RN-3100/-4100

20V

R1=4.22M

R2=464K

SGl=OPEN*

200V

R1=4.22M

R2=42.2K

SGl=OPEN*

200mA

R2=10

20mA

R2=100

2mA

R2=1K

200µA

R2=10K

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C3=0.47µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

C4=l.0µF

R5=46.4K

R5=46.4K

R5=46.4K

R5=46.4K

R5=46.4K

R7=46.4K

R7=46.4K

R5=46.4K

R5=46.4K

R5=46.4K

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

R9=6.65K

R10=50 pot.

Rll=75

R9=6.65K

R10=50 pot.

Rll=75

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

R7=6.65K

R8=50 pot.

R9=75

DM-3100N

DM-3100Ul

DM-3100U2

DM-3100U3

DM-3101

DM-3100B

DM-3104

DM-3100L

DM-3103

DM-3100X

2) Locate the loose components in this kit which will be required to change your particular meter to the desired range.

In the tables above, components prefaced with "C" are capacitors, resistors are listed with an "R" followed by the

resistance value in Ohms, and potentiometers are indicated by the abbreviation "pot". Solder gaps are denoted by

"SG".

3) Open the meter’s case to gain access to the printed circuit board. Low profile models are opened by snapping off the

rear panel, using a screwdriver to carefully depress the retaining tabs located on the sides of the meter. Access to

short-depth models is achieved by removing the cotter pin at the rear of the meter, snapping off the front bezel, and

sliding the PC board forward.

4) Compare the PC board to the assembly drawing for that model as given in this document. Locate the component and

solder gap locations which pertain to the desired modification. Note that some component locations will have no

component installed. For example, Rl and R2 locations for all models do not have components installed.

5) Remove and replace components as necessary to achieve the desired modification. NOTE: WHEN MODIFYING

UNITS TO THE 200V RANGE, IT IS RECOMMENDED THAT THE OPEN SOLDER GAP SG1 BE COV-

ERED WITH CONFORMAL COATING.

6) After reassembling the unit, you may need to recalibrate the meter. This procedure is described in each meter’s

data sheet. A generalized calibration procedure is as follows:

a) Power-on the meter and allow it to warm up for ten minutes.

b) Using a precision voltage source, provide a near full-scale positive signal to the meter’s inputs.

c) Adjust the meter’s gain potentiometer (located at the rear) until the display is correct.

d) Reverse the polarity of the signal input and check the meter’s reading.

REPAIR RETURNS

When returning a modified meter to DATEL for repair, the unit must be restored to its orignal ±2V input configuration

prior to return. Damage to the meter caused by improper modification will void the unit’s warranty.

MODEL

200mV RANGE MODIFICATION

*For DM-4105/4106, Open SG4 (Leave SGl Closed).

TABLE 2: 200mV RANGE CHANGE MODIFICATIONS

TABLE 1: RANGE CHANGE MODIFICATIONS APPLICABLE TO ALL MODELS

RANGE

MODIFICATION