ACCURACY
3-8
Accuracy when Holding a non-optimal Range
When a component is measured outside of its nominal range (in range hold), the accuracy of the
measurement is reduced. The nominal ranges are defined as approximately four times above and below the
nominal impedance value. 100kHz values apply to the SR720 only.
Range Nominal Impedance Range
R3 6.25 Ω - 100 Ω
R2 100 Ω - 1.6 kΩ
R1 1.6 kΩ - 25.6 kΩ
R0 100Hz - 10kHz 25.6 kΩ - 400 kΩ (R0 is not defined for 100 kHz)
Components that are measured while autoranging have only one set of extreme range terms (Kh, Kl) per
frequency. For components measured in range hold the values of K
h
and K
l
are different for each range.
These values are listed below for R, L, C and Z.
Impedance K
l
= Z
l
/ Z
m
K
h
= Z
h
/ Z
m
where Z
m
= the impedance of the device being measured
and Z
l
l & Z
h
are given below.
Resistance K
l
= R
l
/ R
m
K
h
= R
h
/ R
m
where R
m
= the resistance of the device being measured
and R
l
& R
h
are given below.
Frequency Z
l
, R
l
Z
h
, R
h
R3 R2 R1 R0 R3 R2 R1 R0
100,120,1k Hz
1 mΩ 0.02 Ω .2 Ω 4 Ω 400 kΩ 6.5 MΩ 100 MΩ 2 GΩ
10 kHz
1 mΩ 0.02 Ω .2 Ω 6 Ω 400 kΩ 6.5 MΩ 100 MΩ 1.5 GΩ
100 kHz
4 mΩ 0.03 Ω .4 Ω
xxx
200 kΩ 3 MΩ 50 MΩ
xxx
Inductance K
l
= L
l
/ L
m
K
h
= L
h
/ L
m
where L
m
= the inductance of the device being measured
and L
l
& L
h
are given below.
Frequency L
l
L
h
R3 R2 R1 R0 R3 R2 R1 R0
100,120 Hz
1 µH 20 µH 300 µH
5 mH 630 H 10 kH 160 kH 2.6 MH
1 kHz
.1 µH2 µH 30 µH 500 µH
63 H 1 kH 16 kH .26 MH
10 kHz
.02 µH .32 µH5 µH 50 µH
6.3 H 100 H 1 kH 10 kH
100 kHz
.02 µH.1 µH2 µH
xxx 3.2 H 10 H 100 H xxx
Capacitance K
l
= C
l
/ C
m
K
h
= C
m
/ C
m
where C
m
= the inductance of the device being measured
and C
l
& C
m
are given below.
Frequency C
l
C
h
R3 R2 R1 R0 R3 R2 R1 R0
100,120 Hz 4 nF 240 pF 16 pF 2 pF 1600 mF 80 mF 6.7 mF
400 µF
1 kHz 400 pF 24 pF 1.6 pF .1 pf 160 mF 8 mF
670 µF 40 µF
10 kHz 40 pF 2.4 pF .16 pF .01pF 16 mF
800 µF 40 µF2.6 µF
100 kHz 8 pf 2.4 pF .02 pf xxx
200 µF 80 µF4 µF
xxx
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