Epson C I - 4 5 Bedienungsanleitung PDF herunterladen (Seite 8)

1960 E. Grand Ave., 2

Floor,

El Segundo, California 90245

Phone: 310.955.5300

Fax: 310.955.5400

Read the current value from peak to peak, then calculate the effective value using the following

formula:

ip -p

i = [A]

2 2

4.1.2. Measurement of the Drive Level for Tuning Fork crystals

In the case of the tuning fork - type crystal (20kHz to 165kHz), the drive level is very small (1µW maximum). If the CI value is

50kΩ, the current that runs the through the crystal is approximate 4.5µA. This current cannot be read by an oscilloscope as in

the procedure of 4.1.1. due to being too small. Hence, a special instrument must be used for measuring the current: the

selectable level meter.

Use the current probe as in the AT crystal procedure, hen read the current form the meter.

4.1.3.How to use a current robe

Please use the current probe as shown in Figure 4.4. The leads are necessary

in order to measure the current, so please use a cylinder type part even if the

part is surface - mounted. Actual characteristics will not change between a

cylinder - type part and surface - mounted part.

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Epson C I - 4 5 Bedienungsanleitung Seite 8