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LM334 1mA定電流問題

以上是我的線路圖,我的輸出是二極體會隨著溫度變化而改變電阻值,常溫狀態下為67K,
但我查看輸出電流卻只有0.2mA左右,我有這個改變R1與R2的配比數值,
輸出電流最大還是只能看到0.6mA,我的期望數值是1mA,請問我是慎麼地方奢定錯誤嗎?